AD674BBR Analog Devices Inc, AD674BBR Datasheet

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AD674BBR

Manufacturer Part Number
AD674BBR
Description
ADC Single SAR 12-Bit Parallel 28-Pin SOIC W
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD674BBR

Package
28SOIC W
Resolution
12 Bit
Architecture
SAR
Number Of Adcs
1
Number Of Analog Inputs
2
Digital Interface Type
Parallel
Input Type
Voltage
Polarity Of Input Voltage
Unipolar|Bipolar
Rohs Status
RoHS non-compliant
Number Of Bits
12
Sampling Rate (per Second)
66k
Data Interface
Parallel
Number Of Converters
1
Power Dissipation (max)
375mW
Voltage Supply Source
Dual ±
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
28-SOIC (0.300", 7.50mm Width)
Lead Free Status / RoHS Status

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PRODUCT DESCRIPTION
The AD674B and AD774B are complete 12-bit successive-
approximation analog-to-digital converters with three-state
output buffer circuitry for direct interface to 8- and 16-bit
microprocessor busses. A high-precision voltage reference and
clock are included on chip, and the circuit requires only power
supplies and control signals for operation.
The AD674B and AD774B are pin-compatible with the indus-
try standard AD574A, but offer faster conversion time and bus-
access speed than the AD574A and lower power consumption.
The AD674B converts in 15 µs (maximum) and the AD774B
converts in 8 µs (maximum).
The monolithic design is implemented using Analog Devices’
BiMOS II process allowing high-performance bipolar analog
circuitry to be combined on the same die with digital CMOS logic.
Offset, linearity, and scaling errors are minimized by active
laser trimming of thin-film resistors.
Five different grades are available. The J and K grades are
specified for operation over the 0°C to 70°C temperature range.
The A and B grades are specified from –40°C to +85°C, the T grade
is specified from –55°C to +125°C. The J and K grades are
available in a 28-lead plastic DIP or 28-lead SOIC. All other grades
are available in a 28-lead hermetically sealed ceramic DIP.
a
PRODUCT HIGHLIGHTS
1. Industry Standard Pinout: The AD674B and AD774B use
2. Analog Operation: The precision, laser-trimmed scaling and
3. Flexible Digital Interface: On-chip multiple-mode three-state
4. The internal reference is trimmed to 10.00 V with 1% maxi-
5. The AD674B and AD774B are available in versions compli-
READ/CONVERT R/C
DATA MODE SELECT
REFERENCE INPUT
ANALOG COMMON
–12V/–15V SUPPLY
SHORT CYCLE A
BIPOLAR OFFSET
10V REFERENCE
BYTE ADDRESS/
10V SPAN INPUT
20V SPAN INPUT
12V/15V SUPPLY
the pinout established by the industry standard AD574A.
bipolar offset resistors provide four calibrated ranges: 0 V to
10 V and 0 V to 20 V unipolar; –5 V to +5 V and –10 V to
+10 V bipolar. The AD674B and AD774B operate on +5 V
and ± 12 V or ± 15 V power supplies.
output buffers and interface logic allow direct connection to
most microprocessors. The 12 bits of output data can be
read either as one 12-bit word or as two 8-bit bytes (one with
8 data bits, the other with 4 data bits and 4 trailing zeros).
mum error and 10 ppm/°C typical temperature coefficient.
The reference is available externally and can drive up to
2.0 mA beyond the requirements of the converter and bipo-
lar offset resistors.
ant with MIL-STD-883. Refer to the Analog Devices Mili-
tary Products Databook or current AD674B/AD774B/883B
data sheet for detailed specifications.
CHIP ENABLE
CHIP SELECT
5V SUPPLY
REF OUT
BIPOFF
V
REF IN
LOGIC
10V
20V
12/8
V
V
CS
CE
CC
AC
EE
IN
IN
0
FUNCTIONAL BLOCK DIAGRAM
10
11
12
13
14
1
2
3
4
5
6
7
8
9
199.95
k
REF
10V
VOLTAGE
DIVIDER
CLOCK
CONTROL
AD674B /AD774B
+
DAC
+
I REF
AD674B/AD774B
COMP
SAR
N
I DAC
Complete 12-Bit
V
EE
A/D Converters
12
MSB
A
O
U
U
B
U
R
3
S
T
T
E
T
P
T
F
F
E
S
LSB
N
Y
B
B
E
A
N
Y
B
B
E
B
N
Y
B
B
E
C
L
L
L
28
27
26
25
24
23
22
21
20
19
18
17
16
15
STATUS
STS
DB11 (MSB)
DB10
DB9
DB8
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0 (LSB)
DIGITAL
COMMON DC
DIGITAL
DATA
OUTPUTS

Related parts for AD674BBR

AD674BBR Summary of contents

Page 1

PRODUCT DESCRIPTION The AD674B and AD774B are complete 12-bit successive- approximation analog-to-digital converters with three-state output buffer circuitry for direct interface to 8- and 16-bit microprocessor busses. A high-precision voltage reference and clock are included on chip, and the ...

Page 2

AD674B/AD774B–SPECIFICATIONS 10 –15 V 10% or –12 V LOGIC EE Model (AD674B or AD774B) Min Typ Max Min Typ Max RESOLUTION LINEARITY ERROR @ 25° MIN MAX DIFFERENTIAL LINEARITY ERROR (Minimum ...

Page 3

DIGITAL SPECIFICATIONS Parameter LOGIC INPUTS V High Level Input Voltage IH V Low Level Input Voltage IL I High Level Input Current IH I Low Level Input Current IL C Input Capacitance IN LOGIC OUTPUTS V High Level Output Voltage ...

Page 4

... Model Temperature AD674BJN 0°C to 70°C AD674BKN 0°C to 70°C AD674BAR –40°C to +85°C AD674BBR –40°C to +85°C AD674BAD –40°C to +85°C AD674BBD –40°C to +85°C AD674BTD –55°C to +125°C AD774BJN 0°C to 70°C AD774BKN 0° ...

Page 5

DEFINITION OF SPECIFICATIONS Linearity Error Linearity error refers to the deviation of each individual code from a line drawn from “zero” through “full scale.” The point used as “zero” occurs 1/2 LSB (1.22 mV for 10 V span) before the ...

Page 6

AD674B/AD774B Symbol Pin No. Type Name and Function AGND 9 P Analog Ground (Common Byte Address/Short Cycle conversion is started with A 0 cycle is initiated results. During Read (R with ...

Page 7

CIRCUIT OPERATION The AD674B and AD774B are complete 12-bit monolithic A/D converters that require no external components to provide the complete successive-approximation analog-to-digital conversion function. A block diagram is shown in Figure 5. 5V SUPPLY 1 V LOGIC DATA MODE ...

Page 8

AD674B/AD774B Circuit layout should attempt to locate the ADC, associated analog input circuitry, and interconnections as far as possible from logic circuitry. For this reason, the use of wire-wrap circuit construction is not recommended. Careful printed-circuit layout and manufacturing is ...

Page 9

12/8 CONTROL LOGIC The AD674B and AD774B contain on-chip logic to provide conversion initiation and data read operations from signals commonly available in microprocessor systems; this internal logic circuitry is shown in Figure 9. The ...

Page 10

AD674B/AD774B STANDALONE MODE “Standalone” mode is useful in systems with dedicated input ports available and thus not requiring full bus interface capabil- ity. Standalone mode applications are generally able to issue conversion start commands more precisely than full-control mode, resulting ...

Page 11

OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 28-Lead Ceramic DIP Package (D-28) 0.050 (12.83 0.59 + 0.01 – (14.98 0.085 1.42 (36.07) 0.095 (2.41) (2.16) 1.40 (35.56) + – 0.017 0.003 0.1 (2.54) + 0.047 ...

Page 12

AD674B/AD774B Revision History Location Data Sheet changed from REV REV. C. Edits to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . ...

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