12-Bit 100 kSPS
a
A/D Converter
AD1674*
FUNCTIONAL BLOCK DIAGRAM
FEATURES
Complete Monolithic 12-Bit 10 ms Sampling ADC
12/8
On-Board Sample-and-Hold Amplifier CS STS
A
CONTROL
0
Industry Standard Pinout
CE
A
8- and 16-Bit Microprocessor Interface
R/C
AC and DC Specified and Tested
10V
AAACLOCKAASAR A
REF OUT
Unipolar and Bipolar Inputs
REF
12
65 V, 610 V, 0 V10 V, 0 V20 V Input Ranges
Commercial, Industrial and Military Temperature AAAAAA DB11 (MSB)
AGND
COMP DB0 (LSB)
20k 12
Range Grades
REF IN
12
5k 10k
MIL-STD-883 and SMD Compliant Versions Available
A
BIP OFF
20V
10k DAC
IN
5k
A
10V IDAC
IN
2.5k
5k
2.5k
A
SHA
AD1674
PRODUCT DESCRIPTION PRODUCT HIGHLIGHTS
The AD1674 is a complete, multipurpose, 12-bit analog-to- 1. Industry Standard Pinout: The AD1674 utilizes the pinout
digital converter, consisting of a user-transparent onboard established by the industry standard AD574A and AD674A.
sample-and-hold amplifier (SHA), 10 volt reference, clock and
2. Integrated SHA: The AD1674 has an integrated SHA which
three-state output buffers for microprocessor interface.
supports the full Nyquist bandwidth of the converter. The
The AD1674 is pin compatible with the industry standard SHA function is transparent to the user; no wait-states are
AD574A and AD674A, but includes a sampling function while needed for SHA acquisition.
delivering a faster conversion rate. The on-chip SHA has a wide
3. DC and AC Specified: In addition to traditional dc specifica-
input bandwidth supporting 12-bit accuracy over the full
tions, the AD1674 is also fully specified for frequency do-
Nyquist bandwidth of the converter.
main ac parameters such as total harmonic distortion,
The AD1674 is fully specified for ac parameters (such as S/(N+D) signal-to-noise ratio and input bandwidth. These parameters
ratio, THD, and IMD) and dc parameters (offset, full-scale can be tested and guaranteed as a result of the onboard
error, etc.). With both ac and dc specifications, the AD1674 is SHA.
ideal for use in signal processing and traditional dc measure-
4. Analog Operation: The precision, laser-trimmed scaling and
ment applications.
bipolar offset resistors provide four calibrated ranges:
The AD1674 design is implemented using Analog Devices 0 V to +10 V and 0 V to +20 V unipolar, 5 V to +5 V and
BiMOS II process allowing high performance bipolar analog cir- 10 V to +10 V bipolar. The AD1674 operates on +5 V and
cuitry to be combined on the same die with digital CMOS logic. 12 V or 15 V power supplies.
Five different temperature grades are available. The AD1674J 5. Flexible Digital Interface: On-chip multiple-mode
and K grades are specified for operation over the 0C to +70C three-state output buffers and interface logic allow direct
temperature range. The A and B grades are specified from connection to most microprocessors.
40C to +85C; the AD1674T grade is specified from 55C
to +125C. The J and K grades are available in both 28-lead
plastic DIP and SOIC. The A and B grade devices are available
in 28-lead hermetically sealed ceramic DIP and 28-lead SOIC.
The T grade is available in 28-lead hermetically sealed ceramic
DIP.
*Protected by U. S. Patent Nos. 4,962,325; 4,250,445; 4,808,908; RE30586.
REV. C
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
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices. Tel: 617/329-4700 Fax: 617/326-8703
REGISTERS / 3-STATE OUTPUT BUFFERSAD1674SPECIFICATIONS
(T to T , V = +15 V 6 10% or +12 V 6 5%, V = +5 V 6 10%, V = 15 V 6 10% or
MIN MAX CC LOGIC EE
DC SPECIFICATIONS 12 V 6 5% unless otherwise noted)
AD1674J AD1674K
Parameter Min Typ Max Min Typ Max Unit
RESOLUTION 12 12 Bits
INTEGRAL NONLINEARITY (INL) 1 1/2 LSB
DIFFERENTIAL NONLINEARITY (DNL)
(No Missing Codes) 12 12 Bits
1
UNIPOLAR OFFSET @ +25C 3 2 LSB
1
BIPOLAR OFFSET @ +25C 6 4 LSB
1, 2
FULL-SCALE ERROR @ +25C
(with Fixed 50 Resistor from REF OUT to REF IN) 0.1 0.25 0.1 0.25 % of FSR
TEMPERATURE RANGE 0 +70 0 +70 C
3
TEMPERATURE DRIFT
2
Unipolar Offset 2 1 LSB
2
Bipolar Offset 2 1 LSB
2
Full-Scale Error 6 3 LSB
POWER SUPPLY REJECTION
V = 15 V 1.5 V or 12 V 0.6 V 2 1 LSB
CC
V = 5 V 0.5 V 1/2 1/2 LSB
LOGIC
V = 15 V 1.5 V or 12 V 0.6 V 2 1 LSB
EE
ANALOG INPUT
Input Ranges
Bipolar 5 +5 5 +5 Volts
10 +10 10 +10 Volts
Unipolar 0 +10 0 +10 Volts
0 +20 0 +20 Volts
Input Impedance
10 Volt Span 357357 k
20 Volt Span 6 10 14 6 10 14 k
POWER SUPPLIES
Operating Voltages
+4.5 +5.5 +4.5 +5.5 Volts
V
LOGIC
V +11.4 +16.5 +11.4 +16.5 Volts
CC
V 16.5 11.4 16.5 11.4 Volts
EE
Operating Current
I 58 58 mA
LOGIC
I 10 14 10 14 mA
CC
I 14 18 14 18 mA
EE
POWER DISSIPATION 385 575 385 575 mW
INTERNAL REFERENCE VOLTAGE 9.9 10.0 10.1 9.9 10.0 10.1 Volts
4
Output Current (Available for External Loads) 2.0 2.0 mA
(External Load Should Not Change During Conversion
NOTES
1
Adjustable to zero.
2
Includes internal voltage reference error.
3
Maximum change from 25C value to the value at T or T .
MIN MAX
4
Reference should be buffered for 12 V operation.
All min and max specifications are guaranteed.
Specifications subject to change without notice.
2 REV. C