Datasheet

ManualsBrandsANALOG DEVICES ManualsData collecting ICsData acquisition IC - AD converter (ADC) External LFCSP 8 WD

16-Bit, 100 kSPS, Single-Ended

PulSAR ADC in MSOP/QFN

AD7683

Rev. A

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FEATURES

16-bit resolution with no missing codes

Throughput: 100 kSPS

INL: ±1 LSB typical, ±3 LSB maximum

Pseudo differential analog input range

0 V to V

REF

with V

REF

up to VDD

Single-supply operation: 2.7 V to 5.5 V

Serial interface SPI/QSPI/MICROWIRE/DSP compatible

Power dissipation: 4 mW @ 5 V, 1.5 mW @ 2.7 V,

150 μW @ 2.7 V/10 kSPS

Standby current: 1 nA

8-lead packages:

MSOP

3 mm × 3 mm QFN (LFCSP) (SOT-23 size)

Improved second source to ADS8320 and ADS8325

APPLICATIONS

Battery-powered equipment

Data acquisition

Instrumentation

Medical instruments

Process control

APPLICATION DIAGRAM

AD7683

REF

GND

VDD

+IN

–IN

DCLOCK

OUT

3-WIRE SPI

INTERFACE

0.5V TO VDD 2.7V TO 5.5

0V TO V

REF

04301-001

Figure 1.

Table 1. MSOP, QFN (LFCSP)/SOT-23, 14-/16-/18-Bit

PulSAR ADC

Type

100

kSPS

250

kSPS

400 kSPS

500 kSPS

≥1000

kSPS

ADC

Driver

18-Bit True

Differential

AD7691

AD7690

AD7982

AD7984

ADA4941

ADA4841

16-Bit True

Differential

AD7684

AD7687 AD7688

AD7693

ADA4941

ADA4841

16-Bit Pseudo

Differential

AD7680

AD7683

AD7685

AD7694

AD7686 AD7980 ADA4841

14-Bit Pseudo

Differential

AD7940 AD7942 AD7946 ADA4841

GENERAL DESCRIPTION

The AD7683 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

and 5.5 V. It contains a low power, high speed, 16-bit sampling

ADC with no missing codes (B grade), 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. On the

falling edge, it samples an

analog input, +IN, between 0 V to REF with respect to a ground

sense, –IN. The reference voltage, REF, is applied externally and

can be set up to the supply voltage. Its power scales linearly with

throughput.

The AD7683 is housed in an 8-lead MSOP or an 8-lead QFN

(LFCSP) package, with an operating temperature specified from

−40°C to +85°C.

Summary of content (16 pages)

PAGE 1
6-Bit, 100 kSPS, Single-Ended PulSAR ADC in MSOP/QFN AD7683 FEATURES APPLICATION DIAGRAM 0.5V TO VDD 2.7V TO 5.5V VDD DCLOCK AD7683 DOUT 3-WIRE SPI INTERFACE CS GND Figure 1. Table 1.
PAGE 2
AD7683 TABLE OF CONTENTS Features .............................................................................................. 1 Circuit Information.................................................................... 12 Applications ....................................................................................... 1 Converter Operation.................................................................. 12 Application Diagram ........................................................................
PAGE 3
AD7683 SPECIFICATIONS VDD = 2.7 V to 5.5 V; VREF = VDD; TA = –40°C to +85°C, unless otherwise noted. Table 2.
PAGE 4
AD7683 VDD = 5 V; VREF = VDD; TA = –40°C to +85°C, unless otherwise noted. Table 3. VDD = 5 V ± 5% ±3 0.5 ±2 ±0.3 ±0.7 ±0.3 ±0.05 AC ACCURACY Signal-to-Noise Spurious-Free Dynamic Range Total Harmonic Distortion Signal-to-(Noise + Distortion) Effective Number of Bits fIN = 1 kHz fIN = 1 kHz fIN = 1 kHz fIN = 1 kHz fIN = 1 kHz 90 −100 −100 90 14.
PAGE 5
AD7683 TIMING SPECIFICATIONS VDD = 2.7 V to 5.5 V; TA = −40°C to +85°C, unless otherwise noted. Table 5.
PAGE 6
AD7683 ABSOLUTE MAXIMUM RATINGS Table 6. Parameter Analog Inputs +IN1, –IN1 REF Supply Voltages VDD to GND Digital Inputs to GND Digital Outputs to GND Storage Temperature Range Junction Temperature Lead Temperature Range Vapor Phase (60 sec) Infrared (15 sec) 1 Rating GND − 0.3 V to VDD + 0.3 V or ±130 mA GND − 0.3 V to VDD + 0.3 V −0.3 V to +6 V −0.3 V to VDD + 0.3 V −0.3 V to VDD + 0.
PAGE 7
AD7683 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS REF 1 8 AD7683 VDD DCLOCK TOP VIEW 6 DOUT (Not to Scale) GND 4 5 CS 7 –IN 3 04301-005 +IN 2 Figure 6. 8-Lead MSOP and QFN (LFCSP) Pin Configuration Table 8. Pin Function Descriptions Pin No. 1 Mnemonic REF Type 1 AI 2 +IN AI 3 –IN AI 4 5 GND CS P DI 6 7 8 DOUT DCLOCK VDD DO DI P 1 Function Reference Input Voltage. The REF range is from 0.5 V to VDD. It is referred to the GND pin.
PAGE 8
AD7683 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 first code transition. Positive full scale is defined as a level 1½ LSB beyond the last code transition. The deviation is measured from the middle of each code to the true straight line (see Figure 21).
PAGE 9
AD7683 TYPICAL PERFORMANCE CHARACTERISTICS 3 3 POSITIVE DNL = +0.43LSB NEGATIVE DNL = –0.41LSB 2 1 1 0 0 –1 –1 –2 –2 –3 0 16384 32768 49152 –3 65536 04301-011 DNL (LSB) 2 04301-012 INL (LSB) POSITIVE INL = +0.43LSB NEGATIVE INL = –0.97LSB 0 16384 32768 CODE 49152 65536 CODE Figure 7. Integral Nonlinearity vs. Code Figure 10. Differential Nonlinearity vs. Code 7000 120000 62564 VDD = REF = 2.
PAGE 10
AD7683 100 17 95 16 –80 SNR VREF 2.5V = –1dB ENOB THD (dB) 15 SINAD ENOB (Bits) –90 90 –95 VREF 5V = –1dB –100 85 14 2.5 3.0 3.5 4.0 4.5 5.0 13 5.5 –110 04301-015 80 2.0 04301-013 –105 0 40 80 REFERENCE VOLTAGE (V) 120 160 200 FREQUENCY (kHz) Figure 13. SNR, SINAD, and ENOB vs. Reference Voltage Figure 15. THD vs. Frequency 100 1200 95 1000 fS = 100kSPS OPERATING CURRENT (µA) VREF = 5V, –10dB 90 VREF = 5V, –1dB 85 VREF = 2.
PAGE 11
AD7683 900 6 VDD = 5V, fS = 100kSPS 5 800 OFFSET, GAIN ERROR (LSB) OPERATING CURRENT (µA) 4 700 600 VDD = 2.7V, fS = 100kSPS 500 400 300 200 3 2 OFFSET ERROR 1 0 –1 –2 GAIN ERROR –3 04301-018 0 –55 –34 –15 5 25 45 65 85 105 125 TEMPERATURE (°C) 500 250 04301-019 POWER-DOWN CURRENT (nA) 750 –15 5 25 45 65 –6 –55 –35 –15 5 25 45 65 85 105 Figure 19. Offset and Gain Error vs. Temperature 1000 –35 –5 TEMPERATURE (°C) Figure 17. Operating Current vs.
PAGE 12
AD7683 APPLICATIONS INFORMATION +IN SWITCHES CONTROL MSB REF 32,768C 16,384C LSB 4C 2C C SW+ C BUSY COMP GND 32,768C 16,384C 4C 2C C CONTROL LOGIC OUTPUT CODE C MSB LSB SW– 04301-020 CNV –IN Figure 20. ADC Simplified Schematic CIRCUIT INFORMATION The AD7683 is a low power, single-supply, 16-bit ADC using a successive approximation architecture. The AD7683 is capable of converting 100,000 samples per second (100 kSPS) and powers down between conversions.
PAGE 13
AD7683 (NOTE 1) REF 100nF REF 33Ω VDD +IN 0V TO VREF AD7683 2.7nF (NOTE 3) 2.7V TO 5.25V CREF 2.2µF TO 10µF (NOTE 2) –IN (NOTE 4) DCLOCK DOUT 3-WIRE INTERFACE CS GND 04301-022 NOTES 1. SEE VOLTAGE REFERENCE INPUT SECTION FOR REFERENCE SELECTION. 2. CREF IS USUALLY A 10µF CERAMIC CAPACITOR (X5R). 3. SEE DRIVER AMPLIFIER CHOICE SECTION. 4. OPTIONAL FILTER. SEE ANALOG INPUT SECTION. Figure 22.
PAGE 14
AD7683 The AD7683 voltage reference input, REF, has a dynamic input impedance. Therefore, it should be driven by a low impedance source with efficient decoupling between the REF and GND pins, as explained in the Layout section. DCLOCK falling edges. The data is valid on both DCLOCK edges. Although the rising edge can be used to capture the data, a digital host also using the DCLOCK falling edge allows a faster reading rate, provided it has an acceptable hold time.
PAGE 15
AD7683 OUTLINE DIMENSIONS 3.20 3.00 2.80 8 3.20 3.00 2.80 1 5 5.15 4.90 4.65 4 PIN 1 0.65 BSC 0.95 0.85 0.75 1.10 MAX 0.15 0.00 0.38 0.22 COPLANARITY 0.10 0.80 0.60 0.40 8° 0° 0.23 0.08 SEATING PLANE COMPLIANT TO JEDEC STANDARDS MO-187-AA Figure 26. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions Shown in millimeters 0.35 0.30 0.25 0.65 BSC 8 5 PIN 1 INDEX AREA *EXPOSED PAD (BOTTOM VIEW) 0.50 0.40 0.30 4 TOP VIEW 0.80 0.75 0.70 SEATING PLANE 0.80 MAX 0.55 NOM 1 2.48 2.
PAGE 16
AD7683 ORDERING GUIDE Model AD7683ACPZRL 1 AD7683ACPZRL71 AD7683ARM AD7683ARMRL7 AD7683ARMZ1 AD7683ARMZRL71 AD7683BCPZRL1 AD7683BCPZRL71 AD7683BRM AD7683BRMRL7 AD7683BRMZ1 AD7683BRMZRL71 EVAL-AD7683CBZ1 EVAL-CONTROL BRD3Z1, 2 1 2 Integral Nonlinearity ±6 LSB max ±6 LSB max ±6 LSB max ±6 LSB max ±6 LSB max ±6 LSB max ±3 LSB max ±3 LSB max ±3 LSB max ±3 LSB max ±3 LSB max ±3 LSB max Temperature Range –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