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AD7812 Datasheet

10-Bit 4-/8-Channel Sampling ADCs

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a
2.7 V to 5.5 V, 350 kSPS, 10-Bit
4-/8-Channel Sampling ADCs
AD7811/AD7812
FEATURES
10-Bit ADC with 2.3 s Conversion Time
The AD7811 has Four Single-Ended Inputs that
Can Be Configured as Three Pseudo Differential
Inputs with Respect to a Common, or as Two Inde-
pendent Pseudo Differential Channels
The AD7812 has Eight Single-Ended Inputs that Can
Be Configured as Seven Pseudo Differential Inputs
with Respect to a Common, or as Four Independent
Pseudo Differential Channels
Onboard Track and Hold
Onboard Reference 2.5 V ؎ 2.5%
Operating Supply Range: 2.7 V to 5.5 V
Specifications at 2.7 V–3.6 V and 5 V ؎ 10%
DSP-/Microcontroller-Compatible Serial Interface
High Speed Sampling and Automatic Power-Down Modes
Package Address Pin on the AD7811 and AD7812 Allows
Sharing of the Serial Bus in Multipackage Applications
Input Signal Range: 0 V to VREF
Reference Input Range: 1.2 V to VDD
Qualified for Automotive Applications
GENERAL DESCRIPTION
The AD7811 and AD7812 are high speed, low power, 10-bit
A/D converters that operate from a single 2.7 V to 5.5 V supply.
The devices contain a 2.3 µs successive approximation A/D
converter, an on-chip track/hold amplifier, a 2.5 V on-chip refer-
ence and a high speed serial interface that is compatible with the
serial interfaces of most DSPs (Digital Signal Processors) and
microcontrollers. The user also has the option of using an exter-
nal reference by connecting it to the VREF pin and setting the
EXTREF bit in the control register. The VREF pin may be tied
to VDD. At slower throughput rates the power-down mode may
be used to automatically power down between conversions.
The control registers of the AD7811 and AD7812 allow the
input channels to be configured as single-ended or pseudo
differential. The control register also features a software convert
start and a software power-down. Two of these devices can
share the same serial bus and may be individually addressed in
a multipackage application by hardwiring the device address pin.
The AD7811 is available in a small, 16-lead 0.3" wide, plastic
dual-in-line package (mini-DIP), in a 16-lead 0.15" wide, Small
Outline IC (SOIC) and in a 16-lead, Thin Shrink Small Out-
line Package (TSSOP). The AD7812 is available in a small,
20-lead 0.3" wide, plastic dual-in-line package (mini-DIP), in a
20-lead, Small Outline IC (SOIC) and in a 20-lead, Thin Shrink
Small Outline Package (TSSOP).
PRODUCT HIGHLIGHTS
1. Low Power, Single Supply Operation
Both the AD7811 and AD7812 operate from a single 2.7 V
to 5.5 V supply and typically consume only 10 mW of power.
The power dissipation can be significantly reduced at
lower throughput rates by using the automatic power-
down mode e.g., 315 µW @ 10 kSPS, VDD = 3 V—see
Power vs. Throughput.
2. 4-/8-Channel, 10-Bit ADC
The AD7811 and AD7812 have four and eight single-ended
input channels respectively. These inputs can be configured
as pseudo differential inputs by using the Control Register.
3. On-chip 2.5 V (± 2.5%) reference circuit that is powered
down when using an external reference.
4. Hardware and Software Control
The AD7811 and AD7812 provide for both hardware and
software control of Convert Start and Power-Down.
FUNCTIONAL BLOCK DIAGRAMS
CREF
VIN1
VIN2
VIN3
VIN4
MUX
REFIN
VDD AGND DGND
1.23V
REF
BUF
CLOCK
OSC
CHARGE
REDISTRIBUTION
DAC
AD7811
SERIAL
PORT
DOUT
DIN
RFS
TFS
SCLK
VDD /3
COMP
CONTROL
LOGIC
CREF
VIN1
VIN2
VIN3
VIN4
VIN5
VIN6
VIN7
VIN8
MUX
REFIN
VDD AGND DGND
1.23V
REF
BUF
CLOCK
OSC
CHARGE
REDISTRIBUTION
DAC
AD7812
SERIAL
PORT
DOUT
DIN
RFS
TFS
SCLK
VDD /3
COMP
CONTROL
LOGIC
A0 CONVST
A0 CONVST
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., 2014


Analog Devices Semiconductor Electronic Components Datasheet

AD7812 Datasheet

10-Bit 4-/8-Channel Sampling ADCs

No Preview Available !

AD7811/AD7812–SPECIFICATIONS (VDD = 2.7 V to 3.6 V, VDD = 5 V ؎ 10%, GND = 0 V, VREF = VDD
[EXT]. All specifications –40؇C to +105؇C unless otherwise noted.)
Parameter
DYNAMIC PERFORMANCE
Signal to (Noise + Distortion) Ratio1
Total Harmonic Distortion (THD)1
Peak Harmonic or Spurious Noise1
Intermodulation Distortion1, 2
Second Order Terms
Third Order Terms
Channel-to-Channel Isolation1, 2
DC ACCURACY
Resolution
Minimum Resolution for Which
No Missing Codes are Guaranteed
Relative Accuracy1
Differential Nonlinearity1
Gain Error1
Gain Error Match1
Offset Error1
Offset Error Match1
ANALOG INPUT
Input Voltage Range
Input Leakage Current2
Input Capacitance2
REFERENCE INPUTS2
VREF Input Voltage Range
Input Leakage Current
Input Capacitance
ON-CHIP REFERENCE
Reference Error
Temperature Coefficient
LOGIC INPUTS2
VINH, Input High Voltage
VINL, Input Low Voltage
VINH, Input High Voltage
VINL, Input Low Voltage
Input Current, IIN
Input Capacitance, CIN
LOGIC OUTPUTS
Output High Voltage, VOH
Output Low Voltage, VOL
High Impedance Leakage Current
High Impedance Capacitance
CONVERSION RATE
Conversion time
Track/Hold Acquisition Time1
Y Version
58
–66
–80
–67
–67
–80
10
10
±1
±1
±2
± 0.75
±2
± 0.75
0
VREF
±1
20
1.2
VDD
±3
20
± 2.5
50
2.4
0.8
2
0.4
±1
8
4
2.4
0.4
±1
15
2.3
200
Unit
dB min
dB max
dB typ
dB max
dB max
dB typ
Bits
Bits
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
V min
V max
µA max
pF max
V min
V max
µA max
pF max
% max
ppm/°C typ
V min
V max
V min
V max
µA max
pF max
V min
V min
V max
µA max
pF max
µs max
ns max
Test Conditions/Comments
fIN = 30 kHz Any Channel, fSAMPLE = 350 kHz
VREF Internal or External
fa = 29 kHz, fb = 30 kHz
fIN = 20 kHz
Any Channel
Nominal 2.5 V
VDD = 5 V ± 10%
VDD = 5 V ± 10%
VDD = 3 V ± 10%
VDD = 3 V ± 10%
Typically 10 nA, VIN = 0 V to VDD
ISOURCE = 200 µA
VDD = 5 V ± 10%
VDD = 3 V ± 10%
ISINK = 200 µA
–2– REV. CB


Part Number AD7812
Description 10-Bit 4-/8-Channel Sampling ADCs
Maker Analog Devices
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AD7812 Datasheet PDF






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