The ADS823 and ADS826 employ digital error correction
techniques to provide excellent differential linearity for de-
manding imaging applications. Their low distortion and high
SNR give the extra margin needed for medical imaging,
communications, video, and test instrumentation. The ADS823
and ADS826 offer power dissipation of 265mW and also
provide a power down mode, thus reducing power dissipation
to only 20mW.
The ADS823 and ADS826 are specified at a maximum sam-
pling frequency of 60MHz and a single-ended input range of
1.5V to 3.5V. The ADS823 and ADS826 are available in a
SSOP-28 package and are pin-compatible with the 10-bit,
40MHz ADS822 and ADS825, and the 10-bit, 70MHz ADS824.
CLK
VDRV
DESCRIPTION
The ADS823 and ADS826 are pipeline, CMOS Analog-to-
Digital Converters (ADCs) that operate from a single +5V
power supply. These converters provide excellent performance
with a single-ended input and can be operated with a differen-
tial input for added spurious performance. These high-perfor-
mance converters include a 10-bit quantizer, high-bandwidth
track-and-hold, and a high-accuracy internal reference. They
also allow for disabling the internal reference and utilizing
external references. This external reference option provides
excellent gain and offset matching when used in multi-channel
applications or in applications where full-scale range adjust-
ment is required.
+V
S
ADS823
ADS826
Timing
Circuitry
V
IN
IN
IN
T/H
10-Bit
Pipelined
A/D Core
Error
Correction
Logic
3-State
Outputs
D0
•
•
•
D9
CM
Internal
Reference
Optional External
Reference
Int/Ext
PD
OE
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111
= full specified temperature range, single-ended input range = 1.5V to 3.5V, sampling rate = 60MHz, external reference, unless otherwise noted.
ADS823E
PARAMETER
POWER SUPPLY REQUIREMENTS
Supply Voltage: +V
S
Supply Current: +I
S
Power Dissipation: VDRV = 5V
VDRV = 3V
VDRV = 5V
VDRV = 3V
Power Down
Thermal Resistance,
θ
JA
SSOP-28
T
Indicates the same specifications as the ADS823E.
NOTES: (1) ADS826 accepts a +3V clock input. (2) Spurious Free Dynamic Range refers to the magnitude of the largest harmonic. (3) dBFS means dB relative to Full Scale. (4) Two-tone intermodulation
distortion is referred to the largest fundamental tone. This number will be 6dB higher if it is referred to the magnitude of the two-tone fundamental envelope. (5) Effective number of bits (ENOB) is defined
by (SINAD – 1.76)/6.02. (6) A 50kΩ pull-down resistor is inserted internally on OE pin. (7) Includes internal reference. (8) Excludes internal reference. (9) Guaranteed by design.
CONDITIONS
Operating
Operating
External Reference
External Reference
Internal Reference
Internal Reference
Operating
MIN
+4.75
TYP
+5.0
55
275
265
295
285
20
89
MAX
+5.25
335
350
MIN
T
ADS826E
(1)
TYP
T
T
T
T
T
T
T
T
MAX
T
T
T
UNITS
V
mA
mW
mW
mW
mW
mW
°C/W
PIN CONFIGURATION
Top View
SSOP
PIN DESCRIPTIONS
PIN
1
2
3
4
5
6
7
8
9
10
11
12
DESIGNATOR
GND
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Bit 8
Bit 9
Bit 10
OE
DESCRIPTION
Ground
Data Bit 1 (D9) (MSB)
Data Bit 2 (D8)
Data Bit 3 (D7)
Data Bit 4 (D6)
Data Bit 5 (D5)
Data Bit 6 (D4)
Data Bit 7 (D3)
Data Bit 8 (D2)
Data Bit 9 (D1)
Data Bit 10 (D0) (LSB)
Output Enable. HI: High Impedance State.
LO: Normal Operation (Internal Pull-down
Resistor)
Power Down: HI = Power Down; LO = Normal
Convert Clock Input
+5V Supply
Ground
Input Range Select: HI = 2V; LO = 1V
Reference Select: HI = External; LO = Internal
Bottom Reference
Bottom Ladder Bypass
Top Ladder Bypass
Top Reference
Common-Mode Voltage Output
Complementary Input (–)
Analog Input (+)
Ground
+5V Supply
Output Logic Driver Supply Voltage
GND
Bit 1 (MSB)
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Bit 8
1
2
3
4
5
6
7
8
9
ADS823
ADS826
28
27
26
25
24
23
22
21
20
19
18
17
16
15
VDRV
+V
S
GND
IN
IN
CM
REFT
ByT
ByB
REFB
INT/EXT
RSEL
GND
+V
S
Bit 9 10
Bit 10 (LSB) 11
OE 12
PD 13
CLK 14
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
PD
CLK
+V
S
GND
RSEL
INT/EXT
REFB
ByB
ByT
REFT
CM
IN
IN
GND
+V
S
VDRV
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes no responsibility
for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change without notice. No patent rights
or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant any BURR-BROWN product for use in life
support devices and/or systems.
®
3
ADS823, ADS826
TIMING DIAGRAM
N+1
Analog In
N
t
D
Clock
t
CONV
N+2
N+3
N+4
N+5
t
L
t
H
N+6
N+7
5 Clock Cycles
t
2
Data Out
N–5
N–4
N–3
N–2
N–1
N
t
1
N+1
N+2
Data Invalid
SYMBOL
t
CONV
t
L
t
H
t
D
t
1
t
2
DESCRIPTION
Convert Clock Period
Clock Pulse Low
Clock Pulse High
Aperture Delay
Data Hold Time, C
L
= 0pF
New Data Delay Time, C
L
= 15pF max
MIN
16.6
7.9
7.9
3.9
TYP
MAX
100µs
UNITS
ns
ns
ns
ns
ns
ns
8.3
8.3
3
12
PACKAGE /ORDERING INFORMATION
PACKAGE
DRAWING
NUMBER
324
"
324
"
SPECIFIED
TEMPERATURE
RANGE
–40°C to +85°C
"
–40°C to +85°C
"
PACKAGE
MARKING
ADS823E
"
ADS826E
"
ORDERING
NUMBER
(1)
ADS823E
ADS823E/1K
ADS826E
ADS826E/1K
TRANSPORT
MEDIA
Rails
Tape and Reel
Rails
Tape and Reel
PRODUCT
ADS823E
"
ADS826E
"
PACKAGE
SSOP-28
"
SSOP-28
"
NOTE: (1) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /1K indicates 1000 devices per reel). Ordering 1000 pieces
of ADS823E/1K” will get a single 1000-piece Tape and Reel.
DEMO BOARD ORDERING INFORMATION
PRODUCT
ADS823E
DEMO BOARD
DEM-ADS823E
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
ESD damage can range from subtle performance degradation
to complete device failure. Precision integrated circuits may
be more susceptible to damage because very small parametric
changes could cause the device not to meet its published
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