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Datasheet> All Categories > Analog mixed-signal IC> converter> AD7918BRUZ
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AD7918BRUZ

Description
8-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20, ROHS COMPLIANT, MO-153AC, TSSOP-20
CategoryAnalog mixed-signal IC    converter   
File Size2MB，33 Pages
ManufacturerRochester Electronics
Websitehttps://www.rocelec.com/
Environmental Compliance  
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8-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20, ROHS COMPLIANT, MO-153AC, TSSOP-20

AD7918BRUZ Parametric

Parameter NameAttribute value
Is it lead-free?Lead free
Is it Rohs certified?conform to
MakerRochester Electronics
Parts packaging codeTSSOP
package instructionTSSOP,
Contacts20
Reach Compliance Codeunknown
Maximum analog input voltage5 V
Minimum analog input voltage
Maximum conversion time0.8 µs
Converter typeADC, SUCCESSIVE APPROXIMATION
JESD-30 codeR-PDSO-G20
JESD-609 codee3
length6.5 mm
Maximum linear error (EL)0.0488%
Humidity sensitivity level1
Number of analog input channels8
Number of digits10
Number of functions1
Number of terminals20
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Output bit codeBINARY, 2\'S COMPLEMENT BINARY
Output formatSERIAL
Package body materialPLASTIC/EPOXY
encapsulated codeTSSOP
Package shapeRECTANGULAR
Package formSMALL OUTLINE, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)260
Sampling rate1 MHz
Sample and hold/Track and holdTRACK
Maximum seat height1.2 mm
Nominal supply voltage3 V
surface mountYES
Temperature levelINDUSTRIAL
Terminal surfaceMATTE TIN
Terminal formGULL WING
Terminal pitch0.65 mm
Terminal locationDUAL
Maximum time at peak reflow temperature40
width4.4 mm

AD7918BRUZ Preview

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8-Channel, 1 MSPS, 8-/10-/12-Bit ADCs
with Sequencer in 20-Lead TSSOP
AD7908/AD7918/AD7928
FEATURES
Fast throughput rate: 1 MSPS
Specified for AV
DD
of 2.7 V to 5.25 V
Low power
6.0 mW max at 1 MSPS with 3 V supply
13.5 mW max at 1 MSPS with 5 V supply
Eight (single-ended) inputs with sequencer
Wide input bandwidth
AD7928, 70 dB min SINAD at 50 kHz input frequency
Flexible power/serial clock speed management
No pipeline delays
High speed serial interface SPI®/QSPI™/
MICROWIRE™/DSP compatible
Shutdown mode: 0.5 μA max
20-lead TSSOP package
Qualified for automotive applications
REF
IN
V
IN
0
•
•
•
•
•
•
•
•
•
•
•
•
•
V
IN
7
SCLK
SEQUENCER
CONTROL LOGIC
DOUT
DIN
CS
FUNCTIONAL BLOCK DIAGRAM
AV
DD
T/H
8-/10-/12-BIT
SUCCESSIVE
APPROXIMATION
ADC
I/P
MUX
AD7908/AD7918/AD7928
GND
03089-001
GENERAL DESCRIPTION
The AD7908/AD7918/AD7928 are, respectively, 8-bit, 10-bit, and
12-bit, high speed, low power, 8-channel, successive approximation
ADCs. The parts operate from a single 2.7 V to 5.25 V power
supply and feature throughput rates up to 1 MSPS. The parts
contain a low noise, wide bandwidth track-and-hold amplifier that
can handle input frequencies in excess of 8 MHz.
The conversion process and data acquisition are controlled using
CS and the serial clock signal, allowing the device to easily interface
with microprocessors or DSPs. The input signal is sampled on the
falling edge of CS and conversion is also initiated at this point.
There are no pipeline delays associated with the part.
The AD7908/AD7918/AD7928 use advanced design techniques to
achieve very low power dissipation at maximum throughput rates.
At maximum throughput rates, the AD7908/AD7918/AD7928
consume 2 mA maximum with 3 V supplies; with 5 V supplies, the
current consumption is 2.7 mA maximum.
Through the configuration of the control register, the analog input
range for the part can be selected as 0 V to REF
IN
or 0 V to 2 ×
REF
IN
, with either straight binary or twos complement output
coding. The AD7908/AD7918/AD7928 each feature eight single-
ended analog inputs with a channel sequencer to allow a
preprogrammed selection of channels to be converted sequentially.
The conversion time for the AD7908/AD7918/AD7928 is
determined by the SCLK frequency, which is also used as the
master clock to control the conversion.
Rev. D
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
V
DRIVE
Figure 1.
PRODUCT HIGHLIGHTS
1. High Throughput with Low Power Consumption. The AD7908/
AD7918/AD7928 offer up to 1 MSPS throughput rates. At the
maximum throughput rate with 3 V supplies, the AD7908/
AD7918/AD7928 dissipate just 6 mW of power maximum.
2. Eight Single-Ended Inputs with a Channel Sequencer.
A sequence of channels can be selected, through which
the ADC cycles and converts on.
3. Single-Supply Operation with V
DRIVE
Function. The AD7908/
AD7918/AD7928 operate from a single 2.7 V to 5.25 V supply.
The V
DRIVE
function allows the serial interface to connect directly
to either 3 V or 5 V processor systems independent of AV
DD
.
4. Flexible Power/Serial Clock Speed Management. The conversion
rate is determined by the serial clock, allowing the conversion
time to be reduced through the serial clock speed increase. The
parts also feature various shutdown modes to maximize power
efficiency at lower throughput rates. Current consumption is
0.5 μA max when in full shutdown.
5. No Pipeline Delay. The parts feature a standard successive
approximation ADC with accurate control of the sampling
instant via a CS input and once off conversion control.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2006–2010 Analog Devices, Inc. All rights reserved.
AD7908/AD7918/AD7928
TABLE OF CONTENTS
Features .............................................................................................. 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Product Highlights ........................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
AD7908 Specifications................................................................. 3
AD7918 Specifications................................................................. 5
AD7928 Specifications................................................................. 7
Timing Specifications .................................................................. 9
Absolute Maximum Ratings.......................................................... 10
ESD Caution................................................................................ 10
Pin Configuration and Function Descriptions........................... 11
Terminology .................................................................................... 12
Typical Performance Characteristics ........................................... 13
Performance Curves................................................................... 13
Control Register.............................................................................. 15
Sequencer Operation ................................................................. 16
SHADOW Register .................................................................... 17
Circuit Information.................................................................... 18
Converter Operation.................................................................. 18
ADC Transfer Function............................................................. 19
Handling Bipolar Input Signals ................................................ 19
Typical Connection Diagram ................................................... 19
Modes of Operation ................................................................... 21
Power vs. Throughput Rate....................................................... 23
Serial Interface ............................................................................ 23
Microprocessor Interfacing....................................................... 24
Application Hints ....................................................................... 27
Outline Dimensions ....................................................................... 28
Ordering Guide .......................................................................... 29
Automotive Products ................................................................. 29
REVISION HISTORY
12/10—Rev. C to Rev. D
Changes to Features Section............................................................ 1
Added Automotive SINAD and SNR Parameters (Table 1)........ 3
Added Automotive SINAD and SNR Parameters (Table 2)........ 5
Added Automotive SINAD and SNR Parameters (Table 3)........ 7
Added Automotive Temperature Range (Table 5) ....................... 7
Added Automotive Products Section .......................................... 28
Changes to Ordering Guide .......................................................... 28
11/08—Rev. B to Rev. C
Changes to ESD Parameter, Table 5 ............................................. 10
6/06—Rev. A to Rev. B
Updated Format..................................................................Universal
Changes to Reference Section....................................................... 21
9/03—Rev. 0 to Rev. A
Changes to Figure 3........................................................................ 15
Changes to Reference section ....................................................... 18
Rev. D | Page 2 of 32
AD7908/AD7918/AD7928
SPECIFICATIONS
AD7908 SPECIFICATIONS
AV
DD
= V
DRIVE
= 2.7 V to 5.25 V, REF
IN
= 2.5 V, f
SCLK
= 20 MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Table 1.
Parameter
DYNAMIC PERFORMANCE
Signal-to-(Noise + Distortion) (SINAD)
2
Signal-to-Noise Ratio (SNR)
2
Total Harmonic Distortion (THD)
2
Peak Harmonic or Spurious Noise (SFDR)
2
Intermodulation Distortion (IMD)
2
Second-Order Terms
Third-Order Terms
Aperture Delay
Aperture Jitter
Channel-to-Channel Isolation
2
Full Power Bandwidth
DC ACCURACY
2
Resolution
Integral Nonlinearity
Differential Nonlinearity
0 V to REF
IN
Input Range
Offset Error
Offset Error Match
Gain Error
Gain Error Match
0 V to 2 × REF
IN
Input Range
Positive Gain Error
Positive Gain Error Match
Zero Code Error
Zero Code Error Match
Negative Gain Error
Negative Gain Error Match
ANALOG INPUT
Input Voltage Ranges
B Version
1
49
48.5
49
48.5
−66
−64
−90
−90
10
50
−85
8.2
1.6
8
±0.2
±0.2
±0.5
±0.05
±0.2
±0.05
Unit
dB min
dB min
dB min
dB min
dB max
dB max
dB typ
dB typ
ns typ
ps typ
dB typ
MHz typ
MHz typ
Bits
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
−REF
IN
to +REF
IN
biased about REF
IN
with
twos complement output coding
±0.2
±0.05
±0.5
±0.1
±0.2
±0.05
0 to REF
IN
0 to 2 × REF
IN
±1
20
2.5
±1
36
0.7 × V
DRIVE
0.3 × V
DRIVE
±1
10
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
V
V
μA max
pF typ
V
μA max
kΩ typ
V min
V max
μA max
pF max
Rev. D | Page 3 of 32
Test Conditions/Comments
f
IN
= 50 kHz sine wave, f
SCLK
= 20 MHz
B models
W models
B models
W models
fa = 40.1 kHz, fb = 41.5 kHz
f
IN
= 400 kHz
@ 3 dB
@ 0.1 dB
Guaranteed no missed codes to 8 bits
Straight binary output coding
RANGE bit set to 1
RANGE bit set to 0, AV
DD
/V
DRIVE
= 4.75 V to
5.25 V
DC Leakage Current
Input Capacitance
REFERENCE INPUT
REF
IN
Input Voltage
DC Leakage Current
REF
IN
Input Impedance
LOGIC INPUTS
Input High Voltage, V
INH
Input Low Voltage, V
INL
Input Current, I
IN
Input Capacitance, C
IN 3
±1% specified performance
f
SAMPLE
= 1 MSPS
Typically 10 nA, V
IN
= 0 V or V
DRIVE
AD7908/AD7918/AD7928
Parameter
LOGIC OUTPUTS
Output High Voltage, V
OH
Output Low Voltage, V
OL
Floating-State Leakage Current
Floating-State Output Capacitance
3
Output Coding
CONVERSION RATE
Conversion Time
Track-and-Hold Acquisition Time
Throughput Rate
POWER REQUIREMENTS
AV
DD
V
DRIVE
I
DD 4
Normal Mode (Static)
Normal Mode (Operational)
Using Auto Shutdown Mode
Full Shutdown Mode
Power Dissipation
4
Normal Mode (Operational)
Auto Shutdown Mode (Static)
Full Shutdown Mode
B Version
1
Unit
Test Conditions/Comments
I
SOURCE
= 200 μA, AV
DD
= 2.7 V to 5.25 V
I
SINK
= 200 μA
V
DRIVE
− 0.2
V min
0.4
V max
±1
μA max
10
pF max
Straight (natural) binary
Twos complement
800
300
300
1
2.7/5.25
2.7/5.25
600
2.7
2
960
0.5
0.5
13.5
6
2.5
1.5
2.5
1.5
ns max
ns max
ns max
MSPS max
V min/max
V min/max
μA typ
mA max
mA max
μA typ
μA max
μA max
mW max
mW max
μW max
μW max
μW max
μW max
Coding bit set to 1
Coding bit set to 0
16 SCLK cycles with SCLK at 20 MHz
Sine wave input
Full-scale step input
See Serial Interface section
Digital inputs = 0 V or V
DRIVE
AV
DD
= 2.7 V to 5.25 V, SCLK On or Off
AV
DD
= 4.75 V to 5.25 V, f
SCLK
= 20 MHz
AV
DD
= 2.7 V to 3.6 V, f
SCLK
= 20 MHz
f
SAMPLE
= 250 kSPS
(Static)
SCLK on or off (20 nA typ)
AV
DD
= 5 V, f
SCLK
= 20 MHz
AV
DD
= 3 V, f
SCLK
= 20 MHz
AV
DD
= 5 V
AV
DD
= 3 V
AV
DD
= 5 V
AV
DD
= 3 V
1
2
Temperature ranges as follows: B version: −40°C to +85°C.
See Terminology section.
3
Sample tested @ 25°C to ensure compliance.
4
See Power vs. Throughput Rate section.
Rev. D | Page 4 of 32
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AD7918BRUZ Related Products

AD7918BRUZ AD7918BRUZ-REEL7 AD7928BRUZ AD7928BRUZ-REEL7 AD7928BRU AD7928BRU-REEL7 AD7908BRUZ
Description 8-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20, ROHS COMPLIANT, MO-153AC, TSSOP-20 8-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20, ROHS COMPLIANT, MO-153AC, TSSOP-20 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20, ROHS COMPLIANT, MO-153AC, TSSOP-20 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20, ROHS COMPLIANT, MO-153AC, TSSOP-20 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20, MO-153AC, TSSOP-20 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20, MO-153AC, TSSOP-20 8-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20, ROHS COMPLIANT, MO-153AC, TSSOP-20
Is it lead-free? Lead free Lead free Lead free Lead free Contains lead Contains lead Lead free
Is it Rohs certified? conform to conform to conform to conform to incompatible incompatible conform to
Maker Rochester Electronics Rochester Electronics Rochester Electronics Rochester Electronics Rochester Electronics Rochester Electronics Rochester Electronics
Parts packaging code TSSOP TSSOP TSSOP TSSOP TSSOP TSSOP TSSOP
package instruction TSSOP, TSSOP, TSSOP, TSSOP, TSSOP, TSSOP, TSSOP,
Contacts 20 20 20 20 20 20 20
Reach Compliance Code unknown unknown unknown unknown unknown unknown unknow
Maximum analog input voltage 5 V 5 V 5 V 5 V 5 V 5 V 5 V
Maximum conversion time 0.8 µs 0.8 µs 0.8 µs 0.8 µs 0.8 µs 0.8 µs 0.8 µs
Converter type ADC, SUCCESSIVE APPROXIMATION ADC, SUCCESSIVE APPROXIMATION ADC, SUCCESSIVE APPROXIMATION ADC, SUCCESSIVE APPROXIMATION ADC, SUCCESSIVE APPROXIMATION ADC, SUCCESSIVE APPROXIMATION ADC, SUCCESSIVE APPROXIMATION
JESD-30 code R-PDSO-G20 R-PDSO-G20 R-PDSO-G20 R-PDSO-G20 R-PDSO-G20 R-PDSO-G20 R-PDSO-G20
JESD-609 code e3 e3 e3 e3 e0 e0 e3
length 6.5 mm 6.5 mm 6.5 mm 6.5 mm 6.5 mm 6.5 mm 6.5 mm
Maximum linear error (EL) 0.0488% 0.0488% 0.0244% 0.0244% 0.0244% 0.0244% 0.0781%
Humidity sensitivity level 1 1 1 1 1 1 1
Number of analog input channels 8 8 8 8 8 8 8
Number of digits 10 10 12 12 12 12 8
Number of functions 1 1 1 1 1 1 1
Number of terminals 20 20 20 20 20 20 20
Maximum operating temperature 85 °C 85 °C 85 °C 85 °C 85 °C 85 °C 85 °C
Minimum operating temperature -40 °C -40 °C -40 °C -40 °C -40 °C -40 °C -40 °C
Output bit code BINARY, 2\'S COMPLEMENT BINARY BINARY, 2\'S COMPLEMENT BINARY BINARY, 2\'S COMPLEMENT BINARY BINARY, 2\'S COMPLEMENT BINARY BINARY, 2\'S COMPLEMENT BINARY BINARY, 2\'S COMPLEMENT BINARY BINARY, 2\'S COMPLEMENT BINARY
Output format SERIAL SERIAL SERIAL SERIAL SERIAL SERIAL SERIAL
Package body material PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code TSSOP TSSOP TSSOP TSSOP TSSOP TSSOP TSSOP
Package shape RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR
Package form SMALL OUTLINE, THIN PROFILE, SHRINK PITCH SMALL OUTLINE, THIN PROFILE, SHRINK PITCH SMALL OUTLINE, THIN PROFILE, SHRINK PITCH SMALL OUTLINE, THIN PROFILE, SHRINK PITCH SMALL OUTLINE, THIN PROFILE, SHRINK PITCH SMALL OUTLINE, THIN PROFILE, SHRINK PITCH SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius) 260 260 260 260 240 240 260
Sampling rate 1 MHz 1 MHz 1 MHz 1 MHz 1 MHz 1 MHz 1 MHz
Sample and hold/Track and hold TRACK TRACK TRACK TRACK TRACK TRACK TRACK
Maximum seat height 1.2 mm 1.2 mm 1.2 mm 1.2 mm 1.2 mm 1.2 mm 1.2 mm
Nominal supply voltage 3 V 3 V 3 V 3 V 3 V 3 V 3 V
surface mount YES YES YES YES YES YES YES
Temperature level INDUSTRIAL INDUSTRIAL INDUSTRIAL INDUSTRIAL INDUSTRIAL INDUSTRIAL INDUSTRIAL
Terminal surface MATTE TIN MATTE TIN MATTE TIN MATTE TIN TIN LEAD TIN LEAD MATTE TIN
Terminal form GULL WING GULL WING GULL WING GULL WING GULL WING GULL WING GULL WING
Terminal pitch 0.65 mm 0.65 mm 0.65 mm 0.65 mm 0.65 mm 0.65 mm 0.65 mm
Terminal location DUAL DUAL DUAL DUAL DUAL DUAL DUAL
Maximum time at peak reflow temperature 40 40 40 40 30 30 40
width 4.4 mm 4.4 mm 4.4 mm 4.4 mm 4.4 mm 4.4 mm 4.4 mm

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