AD7892AR-1 Analog Devices Inc, AD7892AR-1 Datasheet

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AD7892AR-1

Manufacturer Part Number
AD7892AR-1
Description
IC ADC 12BIT LP 500KSPS 24-SOIC
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD7892AR-1

Data Interface
Serial, Parallel
Rohs Status
RoHS non-compliant
Number Of Bits
12
Sampling Rate (per Second)
500k
Number Of Converters
1
Power Dissipation (max)
90mW
Voltage Supply Source
Single Supply
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
24-SOIC (0.300", 7.50mm Width)
Resolution (bits)
12bit
Sampling Rate
500kSPS
Input Channel Type
Single Ended
Supply Voltage Range - Analog
4.75V To 5.25V
Supply Current
18mA
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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ADI
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Part Number:
AD7892AR-1
Manufacturer:
Analog Devices Inc.
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a
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 (LC
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
2. The AD7892 operates from a single +5 V supply and con-
3. The part offers a high speed, flexible interface arrangement
V
V
IN1
IN2
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.
sumes 60 mW typ making it ideal for low power and portable
applications.
with parallel and serial interfaces for easy connection to
microprocessors, microcontrollers and digital signal
processors.
REF OUT/REF IN
SCALING
CS
SIGNAL
CONTROL LOGIC
FUNCTIONAL BLOCK DIAGRAM
RD
2k
2
MOS) process, a mixed technology process
TRACK/HOLD
EOC
LC
12-Bit 600 kSPS ADC
REFERENCE
CONVST
2
+2.5V
MOS Single Supply,
AGND
12-BIT
ADC
DGND
V
AD7892
DD
CLOCK
AD7892
STANDBY
MODE
DB0
DB2
DB3/RFS
DB4/SCLK
DB5/SDATA
DB10/LOW
DB11/LOW

Related parts for AD7892AR-1

AD7892AR-1 Summary of contents

Page 1

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 ...

Page 2

AD7892–SPECIFICATIONS Parameter A Versions DYNAMIC PERFORMANCE AD7892-1, AD7892-2 3 Signal to (Noise + Distortion) Ratio 70 3 Total Harmonic Distortion –78 3 Peak Harmonic or Spurious Noise –79 3 Intermodulation Distortion 2nd Order Terms –78 3rd Order Terms –78 AD7892-3 ...

Page 3

Parameter A Versions LOGIC OUTPUTS Output High Voltage, V 4.0 OH Output Low Voltage, V 0.4 OL DB11–DB0 ± 10 Floating-State Leakage Current 4 Floating-State Capacitance 15 Output Coding AD7892-1 and AD7892-3 AD7892-2 CONVERSION RATE Conversion Time 1.47 3 Track/Hold ...

Page 4

AD7892 TIMING CHARACTERISTICS A, B Parameter Versions t 1.47 CONV 1.6 t 200 ACQ 400 Parallel Interface ...

Page 5

... Input Model Range ± ± AD7892AN-1 ± ± AD7892BN-1 ± ± AD7892AR-1 ± ± AD7892BR-1 ± ± AD7892SQ-1 AD7892AN +2.5 V AD7892BN +2.5 V AD7892AR +2.5 V AD7892BR +2.5 V ± 2.5 V AD7892AN-3 ± 2.5 V AD7892BN-3 ± 2.5 V AD7892AR-3 ± 2.5 V AD7892BR-3 2 EVAL-AD7892-2CB Evaluation Board ...

Page 6

AD7892 Pin No. Mnemonic Description Positive Supply Voltage ± 5 STANDBY 2 Standby Input. Logic Input. With this input at a logic high, the part is in its normal operating mode; with this input at ...

Page 7

Pin No. Mnemonic Description 16 DB4/SCLK Data Bit 4/Serial Clock. When the device is in its parallel mode, this pin is Data Bit 4, a three-state TTL-compatible output. When the device is in its serial mode, this becomes the serial ...

Page 8

AD7892 TERMINOLOGY Signal to (Noise + Distortion) Ratio This is the measured ratio of signal to (noise + distortion) at the output of the A/D converter. The signal is the rms amplitude of the fundamental. Noise is the rms sum ...

Page 9

CIRCUIT DESCRIPTION The AD7892 is a fast, 12-bit single supply A/D converter. It provides the user with signal scaling, track/hold, reference, A/D converter and versatile interface logic functions on a single chip. The signal scaling on the AD7892-1 allows the ...

Page 10

AD7892 pulse can be applied to the CS and RD inputs to latch data out of the AD7892 and into the gate array or ASIC. This eliminates the logic required in the gate array or ASIC to recognize the end ...

Page 11

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 ± ...

Page 12

AD7892 MICROPROCESSOR INTERFACING The AD7892 features both high speed parallel and serial inter- faces, allowing considerable flexibility in interfacing to micro- processor systems. To obtain optimum performance from the part, data should not be read during conversion and this limits ...

Page 13

Grounding and Layout The AD7892 has a single supply voltage pin, V plies both the analog and digital circuitry on the part. For opti- mum performance from the part recommended that this + taken from the ...

Page 14

AD7892 0.200 (5.08) 0.200 (5.08) 0.125 (3.18) 0.012 (0.30) 0.004 (0.10) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). Plastic DIP (N-24) 1.228 (31.19) 1.226 (31.14 0.260 ± 0.001 (6.61 ± 0.03 PIN 1 0.130 (3.30) ...

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