ADC912AFP Datasheet PDF - Analog Devices
| Part Number | ADC912AFP | |
| Description | CMOS Microprocessor-Compatible 12-Bit A/D Converter | |
| Manufacturers | Analog Devices | |
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a
CMOS Microprocessor-Compatible
12-Bit A/D Converter
FEATURES
Low Cost
Low Transition Noise between Code
12-Bit Accurate
؎1/2 LSB Nonlinearity Error over Temperature
No Missing Codes at All Temperatures
10 s Conversion Time
Internal or External Clock
8- or 16-Bit Data Bus Compatible
Improved ESD Resistant Design
Latchup Resistant Epi-CMOS Processing
Low 95 mW Power Consumption
Space-Saving 24-Lead 0.3" DIP, or 24-Lead SOIC
APPLICATIONS
Data Acquisition Systems
DSP System Front End
Process Control Systems
Portable Instrumentation
GENERAL DESCRIPTION
The ADC912A is a monolithic 12-bit accurate CMOS A/D
converter. It contains a complete successive-approximation A/D
converter built with a high-accuracy D/A converter, a precision
bipolar transistor high-speed comparator, and successive-
approximation logic including three-state bus interface for logic
compatibility. The accuracy of the ADC912A results from the
addition of precision bipolar transistors to Analog Devices’
advanced-oxide isolated silicon-gate CMOS process. Particular
attention was paid to the reduction of transition noise between
adjacent codes achieving a 1/6 LSB uncertainty. The low noise
design produces the same digital output for dc analog inputs
ADC912A
FUNCTIONAL BLOCK DIAGRAM
AGND VREFIN
AIN
12-BIT DAC
5k⍀
ADC912A
SUCCESSIVE
APPROXIMATION
REGISTER
12-BIT LATCH
48
MULTIPLEXER
8
THREE-STATE
OUTPUT
DRIVERS
THREE-STATE
OUTPUT
DRIVERS
CONTROL
LOGIC
CLOCK
OSCILLATOR
VDD
VSS
BUSY
CS
RD
HBEN
CLK OUT
CLK IN
D11 D8
D7 D4 DGND D3/11 D0/8
not located at a transition voltage, see Figures 1 and 2. NPN
digital output transistors provide excellent bus interface timing,
125 ns access and bus disconnect time which results in faster
data transfer without the need for wait states. An external
1.25 MHz clock provides a 10 µs conversion time.
In stand-alone applications an internal clock can be used with
external crystal.
An external negative five-volt reference sets the 0 V to 10 V
input range. Plus 5 V and minus 12 V power supplies result in
95 mW of total power consumption.
256
256 SUCCESSIVE
CONVERSIONS
192 WITH
AIN = 4.99756V
128
100
90
64
0
2045 2046 2047 2048 2049
OUTPUT CODE – Decimal
Figure 1. Code Repetition
10
0%
TRANSITION NOISE
ANALOG INPUT
Figure 2. Transition Noise Cross Plot
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 that
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: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001
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ADC912A
WAFER TEST LIMITS (@ VDD = +5 V, VSS = –12 V or –15 V, VREF = –5 V, AIN = 0 V to 10 V, and TA = 25؇C, unless otherwise noted.)
Parameter
Symbol Conditions
ADC912AG
Limit
Unit
Integral Nonlinearity
Differential Nonlinearity
Offset Error
Gain Error
Analog Input Resistance
Logic Input High Voltage
Logic Input Low Voltage
Logic Input Current
Logic Output High Voltage
Logic Output Low Voltage
Positive Supply Current
Negative Supply Current
INL
DNL
VZSE
GFSE
RAIN
VINH
VINL
IIN
VOH
VOL
IDD
ISS
Guaranteed by Design
CS, RD, HBEN
CS, RD, HBEN
CS, RD, HBEN
ISOURCE = 0.2 mA
ISINK = 1.6 mA
VDD = +5 V, CS = RD = VDD, AIN = +10 V
VSS = –12 V, CS = RD = VDD, AIN = +10 V
±1
±1
±8
±8
4/6
2.4
0.8
±1
4
0.4
7
5
LSB max
LSB max
LSB max
LSB max
kΩ min/max
V min
V max
µA max
V min
V max
mA max
mA max
NOTE
Electrical tests are performed at wafer probe to the limits shown. Due to variations in assembly methods and normal yield loss, yield after packaging is not guaranteed
for standard product dice. Consult factory to negotiate specifications based on dice lot qualification through sample lot assembly and testing.
10V
C1
–5V
C1
R
+
C2
R
C2
+
NC
R = 10⍀
C1 = 0.01F
C2 = 4.7F
NC = NO CONNECT
R
C1
1 24 R
2 23
C1
3 22 NC
4 21 R
5 ADC912A 20
6 TOP VIEW 19
R
(Not to Scale)
7 18 NC
R
8 17
9 16 NC
10 15 NC
11 14 NC
12 13 NC
POWER SUPPLY SEQUENCE:
+5V, –15V, –5V, +10V
+5V
+
C2
–15V
C2
+
Figure 9. Burn-In Circuit
REV. B
–5–
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for ADC912AFP electronic component. |
| Information | Total 16 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ ADC912AFP.PDF Datasheet ] | |
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Featured Datasheets
| Part Number | Description | MFRS |
| ADC912AFP | The function is CMOS Microprocessor-Compatible 12-Bit A/D Converter. Analog Devices | |
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