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Analog Devices Semiconductor Electronic Components Datasheet



AD671

Monolithic 12-Bit 2 MHz A/D Converter


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AD671 pdf
a
Monolithic 12-Bit
2 MHz A/D Converter
AD671
FEATURES
FUNCTIONAL BLOCK DIAGRAM
12-Bit Resolution
24-Pin “Skinny DIP” Package
Conversion Time: 500 ns max—AD671J/K/S-500
AIN BPO/UPO ENCODE REF IN VCC ACOM VEE VLOGIC
20 21
16 19 23 22 24 17
DCOM
18
Conversion Time: 750 ns max—AD671J/K/S-750
Low Power: 475 mW
RANGE
SELECT
X4
Unipolar (0 V to +5 V, 0 V to +10 V) and Bipolar Input
COARSE
8-BIT
Ranges (؎5 V)
Twos Complement or Offset Binary Output Data
Out-of-Range Indicator
MIL-STD-883 Compliant Versions Available
OBSPRODUCT DESCRIPTION
OThe AD671 is a high speed monolithic 12-bit A/D converter
offering conversion rates of up to 2 MHz (500 ns conversion
Ltime). The combination of a merged high speed bipolar/CMOS
Eprocess and a novel architecture results in a combination of
speed and power consumption far superior to previously avail-
TEable hybrid implementations. Additionally, the greater reliability
3-BIT
FLASH
DAC
3-BIT
FLASH
DAC
4-BIT
FLASH
LADDER
MATRIX
3
AD671
3
CORRECTION LOGIC
4
8
LATCHES
FINE
4-BIT
FLASH
4
12
14 13
OTR MSB
12 1
BIT1-12
15
DAV
PRODUCT HIGHLIGHTS
1. The AD671 offers a single chip 2 MHz analog-to-digital
conversion function in a space saving 24-pin DIP.
2. Input signal ranges are 0 V to +5 V and 0 V to +10 V unipo-
lar, and –5 V to +5 V bipolar, selected by pin strapping. In-
put resistance is 1.5 k. Power supplies are +5 V and –5 V,
and typical power consumption is less than 500 mW.
of monolithic construction offers improved system reliability
and lower costs than hybrid designs.
3. The external +5 V reference can be chosen to suit the dc ac-
The AD671 uses a subranging flash conversion technique, with
curacy and temperature drift requirements of the application.
digital error correction for possible errors introduced in the first 4. Output data is available in unipolar, bipolar offset or bipolar
part of the conversion cycle. An on-chip timing generator pro-
twos complement binary format.
vides strobe pulses for each of the four internal flash cycles and
assures adequate settling time for the interflash residue ampli-
fier. A single ENCODE pulse is used to control the converter.
The performance of the AD671 is made possible by using high
speed, low noise bipolar circuitry in the linear sections and low
power CMOS for the logic sections. Analog Devices’ ABCMOS-1
process provides both high speed bipolar and 2-micron CMOS
5. An OUT OF RANGE output bit indicates when the input
signal is beyond the AD671’s input range.
6. The AD671 is available in versions compliant with the MIL-
STD-883. Refer to the Analog Devices Military Products
Databook or current AD671/883B data sheet for detailed
specifications.
devices on a single chip. Laser trimmed thin-film resistors are
used to provide accuracy and temperature stability.
The AD671 is available in two conversion speeds and perfor-
mance grades. The AD671J and K grades are specified for op-
eration over the 0°C to +70°C temperature range. The AD671S
grades are specified for operation over the –55°C to +125°C
temperature range. All grades are available in a 0.300 inch wide
24-pin ceramic DIP. The J and K grades are also available in a
24-pin plastic DIP.
REV. B
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703



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AD671 pdf
AD671–SPECIFICATIONS
DC SPECIFICATIONS (TMIN to TMAX with VCC = +5 V ؎ 5%, VLOGIC = +5 V ؎10%, VEE = –5 V ؎ 5%, VREF = +5.000 V,
unless otherwise noted)
Parameter
AD671J/S-500
Min Typ Max
AD671K-500
Min Typ Max
Units
RESOLUTION
12
12
Bits
ACCURACY (+25°C)
Integral Nonlinearity (INL)
TMIN to TMAX
Differential Nonlinearity (DNL)
؎4 ؎2 LSB
TMIN to TMAX
No Missing Codes
10
10 Bits Guaranteed
11
11 Bits Guaranteed
Bits
Unipolar Offsetl
؎4 ؎4 LSB
Bipolar Zerol
Gain Error2
TEMPERATURE COEFFICIENTS3
Unipolar Offset
Bipolar Zero
Gain Error
OANALOG INPUT
BInput Ranges
Bipolar
SUnipolar
OInput Resistance
L10 Volt Range
E5 Volt Range
Input Capacitance
TEReference Input Resistance
–5
0
0
1.0
0.5
2.4
؎10
0.1 0.25
؎10
؎15
؎20
+5
+5
+10
1.5 2.0
0.75 1.0
10
3.5 4.7
–5
0
0
1.0
0.5
2.4
؎10
0.1 0.25
؎10
؎15
؎20
+5
+5
+10
1.5 2.0
0.75 1.0
10
3.5 4.7
LSB
% FSR
ppm/°C
ppm/°C
ppm/°C
Volts
Volts
Volts
k
k
pF
k
POWER SUPPLIES
Power Supply Rejection4
VCC (+5 V ± 0.25 V)
VLOGIC (+5 V ± 0.5 V)
VEE (–5 V ± 0.25 V)
Operating Voltages
VCC
VLOGIC
VEE
Operating Current
ICC
ILOGIC5
IEE
+4.75
+4.5
–5.25
46
3
46
؎1
؎1
؎1
+5.25
+5.5
–4.75
56
6
56
+4.75
+4.5
–5.25
46
3
46
؎1
؎1
؎1
+5.25
+5.5
–4.75
56
6
56
LSB
LSB
LSB
Volts
Volts
Volts
mA
mA
mA
POWER CONSUMPTION
475 621
475 621
mW
TEMPERATURE RANGE
Specified (J/K)
Specified (S)
0
–55
+70
+125
0
+70 °C
°C
NOTES
1Adjustable to zero with external potentiometers. See Offset/Gain Calibration section for additional information.
2Full-scale range (FSR) is 5 V for the 0 V to 5 V range and 10 V for the 0 V to 10 V and –5 V to +5 V ranges.
325°C to TMIN and 25°C to TMAX.
4Change in gain error as a function of the dc supply voltage.
5Tested under static conditions. See Figure 12 for typical curves of ILOGIC vs. Conversion Rate and Output Loading.
Specifications subject to change without notice.
Specifications shown in boldface are tested on all devices at final electrical test with worst case supply voltages at 0, +25 °C and +70°C. Results from those tests are
used to calculate outgoing quality levels. All min and max specifications are guaranteed, although only those shown in boldface are tested.
–2– REV. B



Part Number AD671
Description Monolithic 12-Bit 2 MHz A/D Converter
Maker Analog Devices - Analog Devices
Total Page 16 Pages
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