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Analog Devices Semiconductor Electronic Components Datasheet

AD574A Datasheet

Complete 12-Bit A/D Converter

No Preview Available !

AD574A pdf
a
Complete
12-Bit A/D Converter
FEATURES
Complete 12-Bit A/D Converter with Reference
and Clock
8- and 16-Bit Microprocessor Bus Interface
Guaranteed Linearity Over Temperature
0؇C to +70؇C – AD574AJ, K, L
–55؇C to +125؇C – AD574AS, T, U
No Missing Codes Over Temperature
35 s Maximum Conversion Time
Buried Zener Reference for Long-Term Stability
and Low Gain T.C. 10 ppm/؇C max AD574AL
12.5 ppm/؇C max AD574AU
Ceramic DIP, Plastic DIP or PLCC Package
Available in Higher Speed, Pinout-Compatible Versions
(15 s AD674B, 80 s AD774B; 10 s (with SHA) AD1674)
Available in Versions Compliant with MIL-STD-883 and
JAN QPL
AD574A*
BLOCK DIAGRAM AND
PIN CONFIGURATION
+5V SUPPLY
VLOGIC
1
28
STATUS
STS
DATA MODE SELECT 2
12/8
MSB
N
27
DB11
MSB
CHIP SELECT
CS
BYTE ADDRESS/
SHORT CYCLE
AO
3
4
CONTROL
I
3
B
B
S
T
L
E
26 DB10
25 DB9
READ/CONVERT 5
R/C
CLOCK
SAR
12 A A 24 DB8
T
CHIP ENABLE
CE
+12/+15V SUPPLY
VCC
+10V REFERENCE
REF OUT
ANALOG COMMON
AC
6
7
8
9
3k
10V
REF
COMP 12
IDAC
IDAC =
4 x N x IREF
EN
O
U
T
P
U
I
B
B
L
E
TB
B
23 DB7
22 DB6
21 DB5
20 DB4
DIGITAL
DATA
OUTPUTS
REFERENCE INPUT 10
REF IN
19.95k
-12/-15V SUPPLY
VEE
BIPOLAR OFFSET
BIP OFF
10V SPAN INPUT
10VIN
20V SPAN INPUT
20VIN
11
12
13
14
9.95k
5k
5k
IREF
DAC N
AD574A 12
8k
VEE
UN
FI
FB
EB
RL
SE
C
LSB
19 DB3
18 DB2
17 DB1
16
DB0
LSB
15
DIGITAL COMMON
DC
PRODUCT DESCRIPTION
The AD574A is a complete 12-bit successive-approximation
analog-to-digital converter with 3-state output buffer circuitry
for direct interface to an 8- or 16-bit microprocessor bus. A high
precision voltage reference and clock are included on-chip, and
the circuit guarantees full-rated performance without external
circuitry or clock signals.
The AD574A design is implemented using Analog Devices’
Bipolar/I2L process, and integrates all analog and digital func-
tions on one chip. Offset, linearity and scaling errors are mini-
mized by active laser-trimming of thin-film resistors at the wafer
stage. The voltage reference uses an implanted buried Zener for
low noise and low drift. On the digital side, I2L logic is used for
the successive-approximation register, control circuitry and
3-state output buffers.
The AD574A is available in six different grades. The AD574AJ,
K, and L grades are specified for operation over the 0°C to
+70°C temperature range. The AD574AS, T, and U are speci-
fied for the –55°C to +125°C range. All grades are available in a
28-pin hermetically-sealed ceramic DIP. Also, the J, K, and L
grades are available in a 28-pin plastic DIP and PLCC, and the
J and K grades are available in ceramic LCC.
The S, T, and U grades in ceramic DIP or LCC are available
with optional processing to MIL-STD-883C Class B; the T
and U grades are available as JAN QPL. The Analog Devices’
Military Products Databook should be consulted for details on
/883B testing of the AD574A.
*Protected by U.S. Patent Nos. 3,803,590; 4,213,806; 4,511,413; RE 28,633 .
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.
PRODUCT HIGHLIGHTS
1. The AD574A interfaces to most 8- or 16-bit microproces-
sors. Multiple-mode three-state output buffers connect di-
rectly to the data bus while the read and convert commands
are taken from the control bus. 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).
2. The precision, laser-trimmed scaling and bipolar offset resis-
tors provide four calibrated ranges: 0 volts to +10 volts and 0
volts to +20 volts unipolar, –5 volts to +5 volts and –10 volts
to +10 volts bipolar. Typical bipolar offset and full-scale cali-
bration errors of ± 0.1% can be trimmed to zero with one ex-
ternal component each.
3. The internal buried Zener reference is trimmed to 10.00
volts with 0.2% maximum error and 15 ppm/°C typical T.C.
The reference is available externally and can drive up to
1.5 mA beyond the requirements of the reference and bipolar
offset resistors.
4. AD674B (15 µs) and AD774B (8 µs) provide higher speed,
pin compatibility; AD1674 (10 µs) includes on-chip Sample-
Hold Amplifier (SHA).
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703


Analog Devices Semiconductor Electronic Components Datasheet

AD574A Datasheet

Complete 12-Bit A/D Converter

No Preview Available !

AD574A pdf
AD574A–SPECIFICATIONS (@ +25؇C with VCC = +15 V or +12 V, VLOGIC = +5 V, VEE = –15 V or –12 V
unless otherwise noted)
Model
RESOLUTION
LINEARITY ERROR @ +25°C
TMIN to TMAX
DIFFERENTIAL LINEARITY ERROR
(Minimum Resolution for Which No
Missing Codes are Guaranteed)
TMIN to TMAX
UNIPOLAR OFFSET (Adjustable to Zero)
AD574AJ
Min Typ Max
12
±1
±1
11
±2
BIPOLAR OFFSET (Adjustable to Zero)
±4
FULL-SCALE CALIBRATION ERROR
(With Fixed 50 Resistor from REF OUT to REF IN)
(Adjustable to Zero)
0.25
TEMPERATURE RANGE
0 +70
TEMPERATURE COEFFICIENTS
(Using Internal Reference)
TMIN to TMAX
Unipolar Offset
Bipolar Offset
Full-Scale Calibration
± 2 (10)
± 2 (10)
± 9 (50)
POWER SUPPLY REJECTION
Max Change in Full-Scale Calibration
VCC = 15 V ± 1.5 V or 12 V ± 0.6 V
VLOGIC = 5 V ± 0.5 V
VEE = –15 V ± 1.5 V or –12 V ± 0.6 V
ANALOG INPUT
Input Ranges
Bipolar
Unipolar
Input Impedance
10 Volt Span
20 Volt Span
±2
± 1/2
±2
–5 +5
–10 +10
0 +10
0 +20
3 57
6 10 14
DIGITAL CHARACTERISTICS1 (TMIN–TMAX)
Inputs2 (CE, CS, R/C, A0)
Logic “1” Voltage
Logic “0” Voltage
Current
Capacitance
Output (DB11–DB0, STS)
Logic “1” Voltage (ISOURCE 500 µA)
Logic “0” Voltage (ISINK 1.6 mA)
Leakage (DB11–DB0, High-Z State)
Capacitance
+2.0
–0.5
–20
+2.4
–20
5
5
+5.5
+0.8
+20
+0.4
+20
POWER SUPPLIES
Operating Range
VLOGIC
VCC
VEE
Operating Current
ILOGIC
ICC
IEE
POWER DISSIPATION
+4.5
+11.4
–11.4
+5.5
+16.5
–16.5
30 40
25
18 30
390 725
INTERNAL REFERENCE VOLTAGE
Output Current (Available for External Loads)3
(External Load Should not Change During Conversion)
9.98
10.0 10.02
1.5
PACKAGE OPTIONS4
Ceramic (D-28)
Plastic (N-28)
PLCC (P-28A)
LCC (E-28A)
AD574ASD
AD574AJN
AD574AJP
AD574AJE
NOTES
1Detailed Timing Specifications appear in the Timing Section.
212/8 Input is not TTL-compatible and must be hard wired to VLOGIC or Digital Common.
3The reference should be buffered for operation on ± 12 V supplies.
4D = Ceramic DIP; N = Plastic DIP; P = Plastic Leaded Chip Carrier.
Specifications subject to change without notice.
AD574AK
Min Typ Max
12
± 1/2
± 1/2
AD574AL
Min Typ
Max
12
± 1/2
± 1/2
Units
Bits
LSB
LSB
12 12 Bits
± 1 ± 1 LSB
± 4 ± 2 LSB
0.25 0.125 % of FS
0
+70 0
+70 °C
± 1 (5)
± 1 (5)
± 5 (27)
± 1 (5) LSB (ppm/°C)
± 1 (5) LSB (ppm/°C)
± 2 (10) LSB (ppm/°C)
± 1 ± 1 LSB
± 1/2 ± 1/2 LSB
± 1 ± 1 LSB
–5
+5 –5
+5 Volts
–10
+10 –10
+10 Volts
0
+10 0
+10 Volts
0
+20 0
+20 Volts
3 5 7 3 5 7 k
6
10 14
6 10 14 k
+2.0
–0.5
–20
+2.4
–20
5
5
+5.5
+0.8
+20
+0.4
+20
+2.0
–0.5
–20
+2.4
–20
5
5
+5.5
+0.8
+20
Volts
Volts
µA
pF
+0.4
+20
Volts
Volts
µA
pF
+4.5
+11.4
–11.4
9.98
+5.5
+16.5
–16.5
30 40
25
18 30
390 725
10.0 10.02
1.5
+4.5
+11.4
–11.4
30
2
18
390
9.99 10.0
+5.5 Volts
+16.5 Volts
–16.5 Volts
40 mA
5 mA
30 mA
725 mW
10.01 Volts
1.5 mA
AD574AKD
AD574AKN
AD574AKP
AD574AKE
AD574ALD
AD574ALN
–2– REV. B


Part Number AD574A
Description Complete 12-Bit A/D Converter
Maker Analog Devices
Total Page 12 Pages
PDF Download
AD574A pdf
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