using state-of-the-art CMOS structures and high volt-
age capacitors. The ISO808 contains a complete 12-bit
capacitor based SAR, ADC with S/H, clock, refer-
ence,
µP
interface, serial out and galvanic isolation.
Laser-trimmed scaling resistors provide standard
industrial input ranges including
±10V, ±5V,
0-5V,
0-4V. They are available in 28-pin 0.6" wide plastic
DIP and are specified over the industrial temperature
range of –40°C to +85°C.
APPLICATIONS
q
INDUSTRIAL PROCESS CONTROL
q
PC-BASED DATA ACQUISITION TEST
EQUIPMENT
Isolation
Barrier
Successive Approximation Register and Control Logic
R/C
20kΩ
R1
IN
10kΩ
R2
IN
5kΩ
R3
IN
CAP
Internal
+2.5V Ref
4kΩ
REF
20kΩ
Clock
BUSY
Serial
Data
Out
Data Clock
Serial Data
SB/BTC
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 • Twx: 910-952-1111
= +5V, using internal reference and fixed resistors shown in Figure 3, unless otherwise specified.
ISO808P
PARAMETER
ISOLATION PARAMETERS
Rated Voltage, Continuous
Partial Discharge, 100% Test
(8)
Creepage Distance (External) DIP = “P” Package
Internal Isolation Distance
Barrier Impedance
Leakage Current
(9)
RESOLUTION
ANALOG INPUT
Voltage Ranges
Impedance
Capacitance
THROUGHPUT SPEED
Conversion Time
Complete Cycle
Throughput Rate
DC ACCURACY
Integral Linearity Error
Differential Linearity Error
No Missing Codes
Transition Noise
(2)
Full Scale Error
(3,4)
Full Scale Error Drift
Full Scale Error Drift
Bipolar Zero Error
(3)
Bipolar Zero Error Drift
Unipolar Zero Error
(3)
Unipolar Zero Error Drift
Power Supply Sensitivity (V
DIG
= V
ANA
= V
D
)
AC ACCURACY
Spurious-Free Dynamic Range
Total Harmonic Distortion
Signal-to-(Noise+Distortion)
Signal-to-Noise
Full-Power Bandwidth
(6)
SAMPLING DYNAMICS
Aperture Delay
Aperture Jitter
Overvoltage Recovery
(7)
REFERENCE
Internal Reference Voltage
Internal Reference Source Current
(Must use external buffer)
External Reference Voltage Range
for Specified Linearity
External Reference Current Drain
DIGITAL INPUTS
Logic Levels
V
IL
V
IH
I
IL
I
IH
DIGITAL OUTPUTS
Data Coding
V
OL
V
OH
No Load
2.48
±10V,
0V to 5V, etc. (See Table I)
See Table I
35
5.7
Acquire and Convert
100
±0.9
±0.9
Guaranteed
0.1
±7
±2
±2
±2
±0.5
8
10
CONDITIONS
MIN
TYP
MAX
UNITS
50Hz
1s, 5pC
1500
2500
16
0.10
>10
13
II 15
240Vrms, 60Hz
240Vrms, 50Hz
1.7
1.4
12
Vrms
Vrms
mm
mm
Ω
II pF
µArms
µArms
Bits
pF
µs
µs
kHz
LSB
(1)
LSB
LSB
%
ppm/°C
ppm/°C
mV
ppm/°C
mV
ppm/°C
LSB
dB
(5)
dB
dB
dB
kHz
ns
ns
ns
Ext. 2.5000V Ref
Bipolar Ranges
Bipolar Ranges
Unipolar Ranges
Unipolar Ranges
+4.75V < V
D
< +5.25V
f
IN
f
IN
f
IN
f
IN
=
=
=
=
45kHz
45kHz
45kHz
45kHz
±10V
±10V
±10V
±10V
±10
±5
±0.5
90
–90
73
73
250
40
Sufficient to meet AC specs
150
2.5
1
2.5
2.52
V
µA
V
µA
2.3
Ext. 2.5000V Ref
2.7
100
–0.3
V
D
–1.0
V
IL
= 0V
V
IH
= 5V
1.0
V
D
+0.3V
±10
±10
V
V
µA
µA
I
SINK
= 1.6mA
I
SOURCE
= 500µA
Binary Two’s Complement or Straight Binary
±0.4
+4
V
V
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.
®
ISO808
2
SPECIFICATIONS
(CONT)
ELECTRICAL
At T
A
= –40°C to +85°C, f
S
= 100kHz, V
DIG
= V
ANA
= +5V, using internal reference and fixed resistors shown in Figure 3, unless otherwise specified.
ISO808P
PARAMETER
POWER SUPPLIES
Specified Performance
V
DIG1
V
ANA
V
DIG2
I
DIG1
I
ANA
I
DIG2
Power Dissipation
TEMPERATURE RANGE
Specified Performance
Storage
Thermal Resistance,
φ
JA
Plastic DIP
CONDITIONS
MIN
TYP
MAX
UNITS
Must be
≤
V
ANA
+4.75
+4.75
+4.75
+5
+5
4.2
16
10.8
175
+5.25
+5.25
+5.25
V
ANA
= V
DIG
= 5V, f
S
= 100kHz
–40
–65
V
V
V
mA
mA
mA
mW
°C
°C
°C/W
+85
+150
75
NOTES: (1) LSB means Least Significant Bit. One LSB for the
±10V
input range is 4.88mV. (2) Typical rms noise at worst case transition. (3) As measured with
fixed resistors shown in Figure 7b. Adjustable to zero with external potentiometer. (4) Full scale error is the worst case of –Full Scale or +Full Scale untrimmed
deviation from ideal first and last code transitions, divided by the transition voltage (not divided by the full-scale range) and includes the effect of offset error. (5)
All specifications in dB are referred to a full-scale input. (6) Usable Bandwidth defined as Full-Scale input frequency at which Signal-to-(Noise + Distortion) degrades
to 60dB. (7) Recovers to specified performance after 2 x FS input overvoltage. (8) All devices receive a 1s test. Failure criterion is
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