EVAL-AD7684CBZ Analog Devices Inc, EVAL-AD7684CBZ Datasheet

BOARD EVALUATION FOR AD7684

EVAL-AD7684CBZ

Manufacturer Part Number
EVAL-AD7684CBZ
Description
BOARD EVALUATION FOR AD7684
Manufacturer
Analog Devices Inc
Series
PulSAR®r
Datasheets

Specifications of EVAL-AD7684CBZ

Number Of Adc's
1
Number Of Bits
16
Sampling Rate (per Second)
100k
Data Interface
Serial
Inputs Per Adc
2 Single
Input Range
±VREF
Power (typ) @ Conditions
4mW @ 5 V, 100kSPS
Voltage Supply Source
Single Supply
Operating Temperature
-40°C ~ 85°C
Utilized Ic / Part
AD7684
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
FEATURES
16-bit resolution with no missing codes
Throughput: 100 kSPS
INL: ±1 LSB typical, ±3 LSB maximum
True differential analog input range: ±V
Single-supply operation: 2.7 V to 5.5 V
Serial interface SPI®-/QSPI-™/MICROWIRE-™/DSP-compatible
Power dissipation
Standby current: 1 nA
8-lead MSOP package
APPLICATIONS
Battery-powered equipment
Data acquisition
Instrumentation
Medical instruments
Process control
GENERAL DESCRIPTION
The AD7684 is a 16-bit, charge redistribution, successive
approximation, PulSAR® analog-to-digital converter (ADC)
that operates from a single power supply, VDD, between 2.7 V
to 5.5 V. It contains a low power, high speed, 16-bit sampling
ADC with no missing codes, an internal conversion clock, and a
serial, SPI-compatible interface port. The part also contains a low
noise, wide bandwidth, short aperture delay, track-and-hold circuit.
Rev. A
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. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
0 V to V
4 mW @ 5 V
1.5 mW @ 2.7 V
150 μW @ 2.7 V/10 kSPS
REF
with V
REF
up to VDD on both inputs
REF
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
Table 1. MSOP, QFN (LFCSP)/SOT-23
14-/16-/18-Bit PulSAR ADC
Type
18-Bit True
16-Bit True
16-Bit Pseudo
Differential
14-Bit Pseudo
On the CS falling edge, it samples the voltage difference
between +IN and –IN pins. The reference voltage, REF, is
applied externally and can be set up to the supply voltage. Its
power scales linearly with throughput.
The AD7684 is housed in an 8-lead MSOP, with an operating
temperature specified from −40°C to +85°C.
Differential
Differential
Differential
V
V
REF
REF
0
0
16-Bit, 100 kSPS PulSAR,
Differential ADC in MSOP
100
kSPS
AD7684
AD7680
AD7683
AD7940
APPLICATION DIAGRAM
©2004–2007 Analog Devices, Inc. All rights reserved.
+IN
–IN
0.5V TO VDD 2.7V TO 5.5V
250
kSPS
AD7691
AD7687
AD7685
AD7694
AD7942
GND
Figure 1.
REF
AD7684
400 kSPS
to
500 kSPS
AD7690
AD7688
AD7693
AD7686
AD7946
VDD
DCLOCK
D
OUT
CS
≥ 1000
kSPS
AD7982
AD7984
AD7980
AD7684
www.analog.com
3-WIRE SPI
INTERFACE
ADC
Driver
ADA4941
ADA4841
ADA4941
ADA4841
ADA4841
ADA4841

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EVAL-AD7684CBZ Summary of contents

Page 1

FEATURES 16-bit resolution with no missing codes Throughput: 100 kSPS INL: ±1 LSB typical, ±3 LSB maximum True differential analog input range: ± with VDD on both inputs REF REF Single-supply operation: 2.7 ...

Page 2

... Changes to Table 6 and Layout ....................................................... 6 Changes to Table 7............................................................................ 7 Changes to Figure 15 Caption....................................................... 10 Changes to Figure 21...................................................................... 12 Changes to Figure 22 and Analog Inputs Section ...................... 13 Changes to Table 9, Digital Interface Section, and Evaluating the Performance of the AD7684 Section..................................... 14 Updated Outline Dimensions ....................................................... 15 Changes to Ordering Guide .......................................................... 15 Converter Operation.................................................................. 12 Transfer Functions ..................................................................... 12 Typical Connection Diagram ...

Page 3

SPECIFICATIONS VDD = 2 5 VDD; T REF A Table 2. Parameter Conditions RESOLUTION ANALOG INPUT 1 Voltage Range +IN − (−IN) Absolute Input Voltage +IN, −IN Common-Mode Input Range +IN, −IN Analog Input CMRR ...

Page 4

AD7684 VDD = VDD −40°C to +85°C, unless otherwise noted. REF A Table 3. Parameter Conditions ACCURACY No Missing Codes Integral Linearity Error Transition Noise 1 Gain Error MIN MAX Gain ...

Page 5

TIMING SPECIFICATIONS VDD = 2 5 −40°C to +85°C, unless otherwise noted. A Table 5. Parameter Throughput Rate CS Falling to DCLOCK Low CS Falling to DCLOCK Rising DCLOCK Falling to Data Remains Valid CS ...

Page 6

AD7684 ABSOLUTE MAXIMUM RATINGS Table 6. Parameter Rating Analog Inputs 1 1 +IN , −IN GND − 0 VDD + 0 ±130 mA REF GND − 0 VDD + 0.3 V Supply Voltages VDD ...

Page 7

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 7. Pin Function Descriptions 1 Pin No. Mnemonic Type Description 1 REF AI Reference Input Voltage. The REF range is from 0 VDD. This pin is referred to the GND pin and ...

Page 8

AD7684 TERMINOLOGY Integral Nonlinearity Error (INL) Linearity error refers to the deviation of each individual code from a line drawn from negative full scale through positive full scale. The point used as negative full scale occurs ½ LSB before the ...

Page 9

TYPICAL PERFORMANCE CHARACTERISTICS 3 POSITIVE INL = +0.83LSB NEGATIVE INL = –1.07LSB –1 –2 –3 0 16384 32768 CODE Figure 7. Integral Nonlinearity vs. Code 120000 94794 100000 80000 60000 40000 18557 17388 20000 0 0 151 ...

Page 10

AD7684 100 95 S/[N+D] 90 ENOB 85 80 2.0 2.5 3.0 3.5 4.0 REFERENCE VOLTAGE (V) Figure 13. SNR, SINAD, and ENOB vs. Reference Voltage 100 VREF = 5V, –10dB 95 VREF = 5V, –1dB 90 VREF = 2.5V, –1dB ...

Page 11

ZERO ERROR 1 0 –1 –2 GAIN ERROR –3 –4 –5 –6 –55 –35 – TEMPERATURE (°C) Figure 19. Zero Error and Gain Error vs. Temperature 85 105 125 Rev. A ...

Page 12

AD7684 APPLICATION INFORMATION +IN REF GND –IN CIRCUIT INFORMATION The AD7684 is a low power, single-supply, 16-bit ADC using a successive approximation architecture capable of converting 100,000 samples per second (100 kSPS) and powers down between conversions. When ...

Page 13

TO V REF (NOTE REF (NOTE 3) NOTE 1: SEE VOLTAGE REFERENCE INPUT SECTION FOR REFERENCE SELECTION. NOTE USUALLY A 10μF CERAMIC CAPACITOR (X5R). REF NOTE 3: SEE DRIVER AMPLIFIER CHOICE SECTION. ...

Page 14

... EVALUATING THE PERFORMANCE OF THE AD7684 Other recommended layouts for the AD7684 are outlined in the evaluation board for the AD7684 (EVAL-AD7684CBZ). The 10k 100k evaluation board package includes a fully assembled and tested ...

Page 15

... LSB maximum AD7684BRMZ 1 ±3 LSB maximum 1 AD7684BRMZRL7 ±3 LSB maximum 1, 2 EVAL-AD7684CBZ 1, 3 EVAL-CONTROL BRD3Z RoHS Compliant Part. 2 This board can be used as a standalone evaluation board or in conjunction with the EVAL-CONTROL BRDx for evaluation/demonstration purposes. 3 This board allows control and communicate with all the Analog Devices, Inc. evaluation boards ending in the CB designators. ...

Page 16

AD7684 NOTES ©2004–2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D04302-0-10/07(A) Rev Page ...

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