Isolated 16-Bit Sampling
ANALOG-TO-DIGITAL CONVERTER
DESCRIPTION
The ISO807 is a low-power isolated sampling ADC
using state-of-the-art CMOS structures and high volt-
age capacitors. The ISO807 contains a complete 16-bit
capacitor based SAR, ADC with S/H, clock, refer-
ence,
P 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.
FEATURES
q
1500Vrms ISOLATION CONTINUOUS
q
25
S CONVERSION TIME
q
16-BIT SERIAL OUTPUT
q
SINGLE +5V SUPPLY
q
28-PIN 0.6" PLASTIC DIP
APPLICATIONS
q
INDUSTRIAL PROCESS CONTROL
q
PC-BASED DATA ACQUISITION TEST
EQUIPMENT
1996 Burr-Brown Corporation
PDS-1320B
Printed in U.S.A. August, 1997
ISO807
ISO807
6k
40k
10k
Internal
+2.5V Ref
Successive Approximation Register and Control Logic
Serial
Data
Out
Clock
Isolation
Barrier
40k
R1
IN
R2
IN
REF
CAP
BUSY
R/C
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
Internet: http://www.burr-brown.com/ FAXLine: (800) 548-6133 (US/Canada Only) Cable: BBRCORP Telex: 066-6491 FAX: (520) 889-1510 Immediate Product Info: (800) 548-6132
2
ISO807
SPECIFICATIONS
ELECTRICAL
At T
A
= 40
C to +85
C, f
S
= 40kHz, V
DIG
= V
ANA
= +5V, using internal reference and fixed resistors shown in Figure 3b, unless otherwise specified.
ISO807P
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
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.
ISOLATION PARAMETERS
Rated Voltage, Continuous
50Hz
1500
Vrms
Partial Discharge, 100% Test
(8)
1s, 5pC
2500
Vrms
Creepage Distance (External) DIP = "P" Package
16
mm
Internal Isolation Distance
0.10
mm
Barrier Impedance
>10
13
II 15
II pF
Leakage Current
(9)
240Vrms, 60Hz
1.7
Arms
240Vrms, 50Hz
1.4
Arms
RESOLUTION
16
Bit
ANALOG INPUT
Voltage Ranges
10, 0 to +5, 0 to +4
V
Impedance
(See Table II)
Capacitance
35
pF
THROUGHPUT SPEED
Conversion Time
20
s
Complete Cycle
Acquire and Convert
25
s
Throughput Rate
40
kHz
DC ACCURACY
Integral Linearity Error
3
LSB
(1)
Differential Linearity Error
+3, 2
LSB
No Missing Codes
15
Bits
Transition Noise
(2)
0.8
LSB
Full Scale Error
(3,4)
0.5
%
Full Scale Error Drift
7
ppm/
C
Full Scale Error Drift
Ext. 2.5000V Ref
0.5
ppm/
C
Bipolar Zero Error
(3)
10V Range
10
mV
Bipolar Zero Error Drift
10V Range
0.5
ppm/
C
Unipolar Zero Error
(3)
0V to 5V, 0V to 4V Ranges
3
mV
Unipolar Zero Error Drift
0V to 5V, 0V to 4V Ranges
0.5
ppm/
C
Power Supply Sensitivity (V
DIG
= V
ANA
= V
S
)
+4.75V < V
S
< +5.25V
8
LSB
AC ACCURACY
Spurious-Free Dynamic Range
f
IN
= 1kHz,
10V
100
dB(
5)
Total Harmonic Distortion
f
IN
= 1kHz,
10V
100
dB
Signal-to-(Noise+Distortion)
f
IN
= 1kHz,
10V
88
dB
Signal-to-Noise
f
IN
= 1kHz,
10V
88
dB
Useable Bandwidth
(6)
130
kHz
SAMPLING DYNAMICS
Aperture Delay
40
ns
Aperture Jitter
20
ps
Overvoltage Recovery
(7)
750
ns
REFERENCE
Internal Reference Voltage
No Load
2.48
2.5
2.52
V
Internal Reference Source Current
1
A
(Must use external buffer.)
Internal Reference Drift
8
ppm/
C
External Reference Voltage Range
2.3
2.5
2.7
V
for Specified Linearity
External Reference Current Drain
Ext. 2.5000V Ref
100
A
DIGITAL INPUTS
Logic Levels
V
IL
0.3
1.0
V
V
IH
V
D
1.0
V
D
+0.3V
V
I
IL
V
IL
= 0V
10
A
I
IH
V
IH
= 5V
10
A
DIGITAL OUTPUTS
Data Coding
Binary Two's Complement or Straight Binary
V
OL
I
SINK
= 1.6mA
0.4
V
V
OH
I
SOURCE
= 500
A
+4
V
3
ISO807
POWER SUPPLIES
Specified Performance
V
DIG1
Must be
V
ANA
+4.75
+5
+5.25
V
V
ANA
+4.75
+5
+5.25
V
V
DIG2
+4.75
+5.25
V
I
DIG1
4.2
mA
I
ANA
5.0
mA
I
DIG2
10.8
mA
Power Dissipation
V
ANA
= V
DIG
= 5V, F
S
= 40kHz
125
mW
TEMPERATURE RANGE
Specified Performance
40
+85
C
Storage
65
+150
C
Thermal Resistance,
JA
Plastic DIP
75
C/W
SPECIFICATIONS
(CONT)
ELECTRICAL
At T
A
= 40
C to +85
C, f
S
= 40kHz, V
DIG
= V
ANA
= +5V, using internal reference and fixed resistors shown in Figure 3b, unless otherwise specified.
ISO807P
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
NOTES: (1) LSB means Least Significant Bit. One LSB for the
10V input range is 3.05
V. (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
5 pulses of
5pC. (9) Tested
at 2500Vrms, 50Hz limit 10
A.
Analog Inputs: R1
IN
...........................................................................
25V
R2
IN
...........................................................................
25V
CAP .................................... V
ANA
+0.3V to AGND2 0.3V
REF ......................................... Indefinite Short to AGND2,
Momentary Short to V
ANA
Ground Voltage Differences: DGND and AGND1 .............................
0.3V
DGND, AGND, and GND
ISO ...........
1563Vrms
V
ANA
....................................................................................................... 7V
V
DIG
to V
ANA
...................................................................................... +0.3V
V
DIG
........................................................................................................ 7V
Digital Inputs .............................................................. 0.3V to V
DIG
+0.3V
Maximum Junction Temperature ................................................... +165
C
Internal Power Dissipation ............................................................. 825mW
Lead Temperature (soldering, 10s) ................................................ +300
C
ABSOLUTE MAXIMUM RATINGS
ELECTROSTATIC
DISCHARGE SENSITIVITY
Electrostatic discharge can cause damage ranging from per-
formance degradation to complete device failure. Burr-
Brown Corporation recommends that all integrated circuits
be handled and stored using appropriate ESD protection
methods.
ESD damage can range from subtle performance degrada-
tion 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
published specifications.
PACKAGE INFORMATION
PACKAGE DRAWING
PRODUCT
PACKAGE
NUMBER
(1)
ISO807P
Plastic DIP
215-1
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix C of Burr-Brown IC Data Book.
ORDERING INFORMATION
MAXIMUM INTEGRAL
TYPICAL SIGNAL-TO-
SPECIFICATION
PRODUCT
LINEARITY ERROR (LSB)
(NOISE + DISTORTION) RATIO (dB)
TEMPERATURE RANGE
PACKAGE
ISO807P
3
83
40
C to +85
C
Plastic DIP
4
ISO807
DIGITAL
PIN #
NAME
I/O
DESCRIPTION
1
RC
I
Read/Convert. With BUSY high, a falling edge on R/C initiates a new conversion.
2
BUSY
O
At the start of conversion BUSY goes LOW and stays LOW until conversion is complete.
3
+5V
DIG2
Isolated Digital Supply Volts.
10
+5V
DIG1
Digital Supply Volts.
11
+5V
ANA
Analog Supply Volts.
12
R1
IN
Analog Input.
13
NC
No Connection. Leave unconnected.
14
R2
IN
Analog Input.
15
CAP
Reference Buffer Output. 2.2
F tantalum capacitor to ground.
16
REF
Reference Input/Output. 2.2
F tantalum capacitor to ground.
17
AGND
Analog Ground.
18
SB/BTC
I
Selects Straight Binary or Binary Two's Complement for Output Data Format.
19
DGND1
Digital Ground.
26
DGND2
Isolated Ground.
27
DATACLK
O
Data Clock Output.
28
SDATA
O
Serial Output Synchronized to DATACLK.
TABLE I. Pin Assignments.
PIN CONFIGURATION
ANALOG
CONNECT R1
IN
CONNECT R2
IN
INPUT
VIA 200
VIA 100
RANGE
TO
TO
IMPEDANCE
10V
V
IN
CAP
45.7k
0V to 5V
AGND
V
IN
20.0k
0V to 4V
V
IN
V
IN
21.4k
TABLE II. Input Range Connections. See also Figure 3.
R/C
BUSY
DATACLK
OPERATION
1
Output
Initiates conversion "n". Valid data from conversion "n-1" clocked out on SDATA.
0
X
New conversion initiated without acquisition of a new signal. Data will be invalid. R/C must be HIGH when BUSY goes HIGH.
X
0
X
New convert commands ignored. Conversion "n" in progress.
TABLE III. Control Functions
SDATA
DATACLK
DGND2
DGND1
SB/BTC
AGND
REF
CAP
R/C
BUSY
+5V
DIG2
+5V
DIG1
+5V
ANA
R1
IN
NC
R2
IN
1
2
3
10
11
12
13
14
28
27
26
19
18
17
16
15
ISO807
5
ISO807
FREQUENCY SPECTRUM
(8192 Point FFT; f
IN
= 15kHz, 0dB)
0
10
20
30
40
50
60
70
80
90
100
110
120
130
0
5
10
15
20
Amplitude (dB)
Frequency (kHz)
TYPICAL PERFORMANCE CURVES
At T
A
= +25
C, f
S
= 40kHz, V
DIG
= V
ANA
= +5V, using internal reference and fixed resistors shown in Figure 3b, unless otherwise specified.
A.C. PARAMETERS vs TEMPERATURE
(f
IN
= 1kHz, 0dB)
SFDR
THD
Temperature (C)
75
50
25
0
25
50
75
100
125
150
110
105
100
95
90
85
80
80
85
90
95
100
105
110
SFDR, SINAD, and SNR (dB)
THD (dB)
SNR
SINAD
SIGNAL-TO-(NOISE + DISTORTION) vs TEMPERATURE
(f
IN
= 1kHz, 0dB; f
S
= 10kHz to 40kHz)
Temperature (C)
75
50
25
0
25
50
75
100
125
150
40kHz
100
95
90
85
80
75
SINAD (dB)
30kHz
20kHz
10kHz
SIGNAL-TO-(NOISE + DISTORTION)
vs INPUT FREQUENCY (f
IN
= 0dB)
Input Signal Frequency (Hz)
100
1k
10k
100k
1M
100
80
90
70
60
50
40
30
20
10
SINAD (dB)
SIGNAL-TO-(NOISE + DISTORTION)
vs INPUT FREQUENCY AND INPUT AMPLITUDE
Input Signal Frequency (kHz)
0
2
4
6
8
10
12
14
16
18
20
100
80
90
70
60
50
40
30
20
10
SINAD (dB)
0dB
20dB
60dB
FREQUENCY SPECTRUM
(8192 Point FFT; f
IN
= 1kHz, 0dB)
0
10
20
30
40
50
60
70
80
90
100
110
120
130
0
5
10
15
20
Amplitude (dB)
Frequency (kHz)
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