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PDF AD7892 Data sheet ( Hoja de datos )
| Número de pieza | AD7892 | |
| Descripción | LC2MOS Single Supply/ 12-Bit 600 kSPS ADC | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
Fast 12-Bit ADC with 1.47 s Conversion Time
600 kSPS Throughput Rate (AD7892-3)
500 kSPS Throughput Rate (AD7892-1, AD7892-2)
Single Supply Operation
On-Chip Track/Hold Amplifier
Selection of Input Ranges:
؎10 V or ؎5 V for AD7892-1
0 V to +2.5 V for AD7892-2
؎2.5 V for AD7892-3
High Speed Serial and Parallel Interface
Low Power, 60 mW typ
Overvoltage Protection on Analog Inputs (AD7892-1
and AD7892-3)
LC2MOS Single Supply,
12-Bit 600 kSPS ADC
AD7892
FUNCTIONAL BLOCK DIAGRAM
REF OUT/REF IN
2k⍀
+2.5V
REFERENCE
VDD
AD7892
MODE
VIN1
VIN2
SIGNAL
SCALING
TRACK/HOLD
CONTROL LOGIC
12-BIT
ADC
CLOCK
DB0
DB2
DB3/RFS
DB4/SCLK
DB5/SDATA
DB10/LOW
DB11/LOW
CS RD EOC CONVST AGND DGND STANDBY
GENERAL DESCRIPTION
The AD7892 is a high speed, low power, 12-bit A/D converter
that operates from a single +5 V supply. The part contains a
1.47 µs successive approximation ADC, an on-chip track/hold
amplifier, an internal +2.5 V reference and on-chip versatile
interface structures that allow both serial and parallel connec-
tion to a microprocessor. The part accepts an analog input range
of ± 10 V or ± 5 V (AD7892-1), 0 V to +2.5 V (AD7892-2) and
± 2.5 V (AD7892-3). Overvoltage protection on the analog inputs
for the AD7892-1 and AD7892-3 allows the input voltage to go
to ± 17 V or ± 7 V respectively without damaging the ports.
The AD7892 offers a choice of two data output formats: a
single, parallel, 12-bit word or serial data. Fast bus access times
and standard control inputs ensure easy parallel interface to
microprocessors and digital signal processors. A high speed
serial interface allows direct connection to the serial ports of
microcontrollers and digital signal processors.
In addition to the traditional dc accuracy specifications such as
linearity, full-scale and offset errors, the part is also specified for
dynamic performance parameters including harmonic distortion
and signal-to-noise ratio.
The AD7892 is fabricated in Analog Devices’ Linear Compat-
ible CMOS (LC2MOS) process, a mixed technology process
that combines precision bipolar circuits with low power CMOS
logic. It is available in a 24-lead, 0.3" wide, plastic or hermetic
DIP or in a 24-lead SOIC.
PRODUCT HIGHLIGHTS
1. The AD7892-3 features a conversion time of 1.47 µs and a
track/hold acquisition time of 200 ns. This allows a through-
put rate for the part up to 600 kSPS. The AD7892-1 and
AD7892-2 operate with throughput rates of 500 kSPS.
2. The AD7892 operates from a single +5 V supply and con-
sumes 60 mW typ making it ideal for low power and portable
applications.
3. The part offers a high speed, flexible interface arrangement
with parallel and serial interfaces for easy connection to
microprocessors, microcontrollers and digital signal
processors.
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
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: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2000
1 page  
AD7892
ORDERING GUIDE
Model
Input
Range
Sample
Rate
Relative
Accuracy
Temperature
Range
Package
Option1
AD7892AN-1
AD7892BN-1
AD7892AR-1
AD7892BR-1
AD7892SQ-1
AD7892AN-2
AD7892BN-2
AD7892AR-2
AD7892BR-2
AD7892AN-3
AD7892BN-3
AD7892AR-3
AD7892BR-3
EVAL-AD7892-2CB2
EVAL-AD7892-3CB2
EVAL-CONTROL BOARD3
± 5 V or ± 10 V
± 5 V or ± 10 V
± 5 V or ± 10 V
± 5 V or ± 10 V
± 5 V or ± 10 V
0 V to +2.5 V
0 V to +2.5 V
0 V to +2.5 V
0 V to +2.5 V
± 2.5 V
± 2.5 V
± 2.5 V
± 2.5 V
Evaluation Board
Evaluation Board
Controller Board
500 kSPS
500 kSPS
500 kSPS
500 kSPS
500 kSPS
500 kSPS
500 kSPS
500 kSPS
500 kSPS
600 kSPS
600 kSPS
600 kSPS
600 kSPS
± 1 LSB
± 1 LSB
± 1 LSB
± 1 LSB
± 1 LSB
± 1 LSB
± 1 LSB
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–55°C to +125°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
N-24
N-24
R-24
R-24
Q-24
N-24
N-24
R-24
R-24
N-24
N-24
R-24
R-24
NOTES
1N = Plastic DIP; Q = Cerdip; R = SOIC.
2These boards can be used as stand-alone evaluation boards or in conjunction with the EVAL-CONTROL BOARD for evaluation/demonstration purposes.
3This board is a complete unit allowing a PC to control and communicate with all Analog Devices’ evaluation boards ending in the CB designators.
REV. C
–5–
5 Page 
AD7892
The designed code transitions occur midway between successive
integer LSB values (i.e., 1/2 LSB, 3/2 LSBs, 5/2 LSBs). Output
coding is two’s complement binary with 1 LSB = FSR/4096 =
20 V/4096 = 4.88 mV for the ± 10 V range and 1 LSB = FSR/
4096 = 10 V/4096 = 2.44 mV for the ± 5 V range. The ideal
input/output transfer function for the AD7892-1 is shown in
Table I.
AD7892-2
The analog input section for the AD7892-2 contains no biasing
resistors. The analog input looks directly into the track/hold
input stage. The analog input range on the VIN1 input is 0 V to
+2.5 V. The VIN2 input can be left unconnected but if it is
connected to a potential then that potential must be AGND.
The VIN1 input connects directly to the input sampling capacitor
of the AD7892-2’s track/hold. The value of this input sampling
capacitor is nominally 10 pF.
Once again, the designed code transitions occur midway be-
tween successive integer LSB values (i.e., 1/2 LSB, 3/2 LSBs,
5/2 LSBs). Output coding is straight (natural) binary with
1 LSB = FSR/4096 = 2.5 V/4096 = 0.61 mV. The ideal input/
output transfer function for the AD7892-2 is shown in Table II.
Table I. Ideal Input/Output Code Table for the AD7892-1
Analog Input
Digital Output
Code Transition
+FSR/2 – 3/2 LSB1, 2 (9.99268 or 4.99634)3
+FSR/2 – 5/2 LSBs (9.98779 or 4.99390)
+FSR/2 – 7/2 LSBs (9.98291 or 4.99146)
AGND + 3/2 LSB (0.00732 or 0.00366)
AGND + 1/2 LSB (0.00244 or 0.00122)
AGND – 1/2 LSB (–0.00244 or –0.00122)
AGND – 3/2 LSB (–0.00732 or –0.00366)
–FSR/2 + 5/2 LSB (–9.98779 or –4.99390)
–FSR/2 + 3/2 LSB (–9.99268 or –4.99634)
–FSR/2 + 1/2 LSB (–9.99756 or –4.99878)
011 . . . 110 to 011 . . . 111
011 . . . 101 to 011 . . . 110
011 . . . 100 to 011 . . . 101
000 . . . 001 to 000 . . . 010
000 . . . 000 to 000 . . . 001
111 . . . 111 to 000 . . . 000
111 . . . 110 to 111 . . . 111
100 . . . 010 to 100 . . . 011
100 . . . 001 to 100 . . . 010
100 . . . 000 to 100 . . . 001
NOTES
1FSR is full-scale range and REF IN = +2.5 V, is 20 V for the ± 10 V range and 10 V
for the ± 5 V range.
21 LSB = FSR/4096 = 4.88 mV (± 10 V range) and 2.44 mV (± 5 V range) with REF
IN = +2.5 V.
3± 10 V range or ± 5 V range.
Table II. Ideal Input/Output Code Table for the AD7892-2
Analog Input
Digital Output
Code Transition
+FSR – 3/2 LSB1, 2 (2.499084 V)
+FSR – 5/2 LSBs (2.498474 V)
+FSR – 7/2 LSBs (2.497864 V)
AGND + 5/2 LSB (0.001526 V)
AGND + 3/2 LSB (0.00916 V)
AGND + 1/2 LSB (0.000305 V)
111 . . . 110 to 111 . . . 111
111 . . . 110 to 111 . . . 110
111 . . . 100 to 111 . . . 101
000 . . . 010 to 010 . . . 011
000 . . . 001 to 001 . . . 010
000 . . . 000 to 000 . . . 001
NOTES
1FSR is full-scale range and is 2.5 V with REF IN = +2.5 V.
21 LSB = FSR/4096 = 0.61 mV with REF IN = +2.5 V.
AD7892-3
Figure 5 shows the analog input section for the AD7892-3. The
analog input range is ± 2.5 V on the VIN1 input. The VIN2 input
can be left unconnected but if it is connected to a potential then
that potential must be AGND. The input resistance on the VIN1
is 1.8 kΩ nominal. As a result, the VIN1 input should be driven
from a low impedance source. The resistor attenuator stage is
followed by the high input impedance stage of the track/hold
amplifier. This resistor attenuator stage allows the input voltage
to go to ± 7 V without damaging the AD7892-3.
The designed code transitions occur midway between succes-
sive integer LSB values (i.e., 1/2 LSB, 3/2 LSBs, 5/2 LSBs).
Output coding is two’s complement binary with 1 LSB = FSR/
4096 = 5 V/4096 = 1.22 mV with REF IN = +2.5 V. The ideal
input/output transfer function for the AD7892-3 is shown in
Table III.
REF OUT/
REF IN
VIN1
VIN2*
2k⍀
+2.5
REFERENCE
3.25k⍀
3.25k⍀
TO ADC
REFERENCE
CIRCUITRY
TO HIGH
IMPEDANCE
SHA INPUT
AGND
* UNCONNECTED INTERNALLY ON THE AD7892-3
Figure 5. AD7892-3 Analog Input Structure
Table III. Ideal Input/Output Code Table for the AD7892-3
Analog Input
Digital Output
Code Transition
+FSR/2 – 3/2 LSB1, 2 (2.49817)
+FSR/2 – 5/2 LSBs (2.49695)
+FSR/2 – 7/2 LSBs (2.49573)
AGND + 3/2 LSB (0.00183)
AGND + 1/2 LSB (0.00061)
AGND – 1/2 LSB (–0.00061)
AGND – 3/2 LSB (–0.00183)
–FSR/2 + 5/2 LSB (–2.49695)
–FSR/2 + 3/2 LSB (–2.49817)
–FSR/2 + 1/2 LSB (–2.49939)
011 . . . 110 to 011 . . . 111
011 . . . 110 to 011 . . . 110
011 . . . 110 to 011 . . . 101
000 . . . 001 to 000 . . . 010
000 . . . 000 to 000 . . . 001
111 . . . 111 to 000 . . . 000
111 . . . 110 to 111 . . . 111
100 . . . 010 to 100 . . . 011
100 . . . 001 to 100 . . . 010
100 . . . 000 to 100 . . . 001
NOTES
1FSR is full-scale range and is 5 V with REF IN = +2.5 V.
21 LSB = FSR/4096 = 1.22 mV with REF IN = +2.5 V.
REV. C
–11–
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AD7892.PDF ] | |
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