AD7920AKS Analog Devices, AD7920AKS Datasheet

AD7920AKS

Manufacturer Part Number

AD7920AKS

Description

Manufacturer

Analog Devices

Datasheet

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GENERAL DESCRIPTION

The AD7910/AD7920 are respectively 10-bit and 12-bit, high

speed, low power, successive approximation ADCs. The parts

operate from a single 2.35 V to 5.25 V power supply and feature

throughput rates up to 250 kSPS. The parts contain a low noise,

wide bandwidth track-and-hold amplifier that can handle input

frequencies in excess of 13 MHz.

The conversion process and data acquisition are controlled

using CS and the serial clock, allowing the devices to interface

with microprocessors or DSPs. The input signal is sampled on

the falling edge of CS and the conversion is also initiated at this

point. There are no pipeline delays associated with the part.

The AD7910/AD7920 use advanced design techniques to achieve

very low power dissipation at high throughput rates.

REV. 0

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. 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 companies.

FEATURES

Throughput Rate: 250 kSPS

Specified for V

Low Power:

Wide Input Bandwidth:

Flexible Power/Serial Clock Speed Management

No Pipeline Delays

High Speed Serial Interface

Standby Mode: 1 A Max

6-Lead SC70 Package

8-Lead MSOP Package

APPLICATIONS

Battery-Powered Systems

Instrumentation and Control Systems

Data Acquisition Systems

High Speed Modems

Optical Sensors

3.6 mW Typ at 250 kSPS with 3 V Supplies

12.5 mW Typ at 250 kSPS with 5 V Supplies

71 dB SNR at 100 kHz Input Frequency

Personal Digital Assistants

Medical Instruments

Mobile Communications

SPI™/QSPI™/MICROWIRE™/DSP Compatible

of 2.35 V to 5.25 V

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel:

Fax: 781/326-8703

10-/12-Bit ADCs in 6-Lead SC70

The reference for the part is taken internally from V

allows the widest dynamic input range to the ADC. Thus the

analog input range for the part is 0 to V

is determined by the SCLK.

PRODUCT HIGHLIGHTS

1. 10-/12-Bit ADCs in SC70 and MSOP Packages.

2. Low Power Consumption.

3. Flexible Power/Serial Clock Speed Management.

4. Reference derived from the power supply.

5. No Pipeline Delay.

The conversion rate is determined by the serial clock, allowing

the conversion time to be reduced through the serial clock

speed increase. This allows the average power consumption to

be reduced when Power-Down mode is used while not convert-

ing. The part also features a Power-Down mode to maximize

power efficiency at lower throughput rates. Current consumption

is 1 A max and 50 nA typically when in Power-Down mode.

The parts feature a standard successive approximation ADC

with accurate control of the sampling instant via a CS input

and once-off conversion control.

781/329-4700

FUNCTIONAL BLOCK DIAGRAM

T/H

AD7910/AD7920

APPROXIMATION

SUCCESSIVE

10-/12-BIT

CONTROL

AD7910/AD7920

LOGIC

ADC

GND

. The conversion rate

250 kSPS,

www.analog.com

SCLK

SDATA

DD.

This

Related parts for AD7920AKS

AD7920AKS Summary of contents

Page 1

... 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 companies. 10-/12-Bit ADCs in 6-Lead SC70 ...

Page 2

AD7910–SPECIFICATIONS Parameter DYNAMIC PERFORMANCE Signal-to-Noise + Distortion (SINAD) 3 Total Harmonic Distortion (THD) Peak Harmonic or Spurious Noise (SFDR) 3 Intermodulation Distortion (IMD) Second Order Terms Third Order Terms Aperture Delay Aperture Jitter Full Power Bandwidth DC ACCURACY Resolution Integral ...

Page 3

AD7920–SPECIFICATIONS Parameter DYNAMIC PERFORMANCE Signal-to-Noise + Distortion (SINAD) 3 Signal-to-Noise Ratio (SNR) 3 Total Harmonic Distortion (THD) Peak Harmonic or Spurious Noise (SFDR) 3 Intermodulation Distortion (IMD) Second-Order Terms Third-Order Terms Aperture Delay Aperture Jitter Full Power Bandwidth DC ACCURACY ...

Page 4

AD7910/AD7920 AD7920–SPECIFICATIONS Parameter POWER REQUIREMENTS Normal Mode (Static) Normal Mode (Operational) Full Power-Down Mode 7 Power Dissipation Normal Mode (Operational) Full Power-Down NOTES 1 Temperature range from –40°C to +85°C. 2 Operational from V = 2.0 ...

Page 5

I 200 OUTPUT PIN C L 50pF I 200 A OH Figure 1. Load Circuit for Digital Output Timing Specifications SCLK SDATA Z ZERO ZERO THREE- 4 LEADING ZEROS STATE ...

Page 6

... Thermal Impedance . . . . . . . . . . . . . . . . . . . . 43.74°C/W JC Temperature Model Range AD7910AKS –40°C to +85°C AD7910ARM –40°C to +85°C AD7920AKS –40°C to +85°C AD7920BKS –40°C to +85°C AD7920BRM –40°C to +85°C NOTES 1 Linearity Error here refers to integral nonlinearity SC70 MSOP. ...

Page 7

SC70 AD7910/ AD7920 GND TOP VIEW IN (Not to Scale) Mnemonic Function CS Chip Select. Active low logic input. This input provides the dual function of initiating conversions on the AD7910/ AD7920 and ...

Page 8

AD7910/AD7920 TERMINOLOGY Integral Nonlinearity This is the maximum deviation from a straight line passing through the endpoints of the ADC transfer function. For the AD7920 and AD7910, the endpoints of the transfer function are zero scale, a point 1 LSB ...

Page 9

TPC 1 and TPC 2 show a typical FFT plot for the AD7920 and AD7910, respectively, at 250 kSPS sampling rate and 100 kHz input frequency. TPC 3 shows the signal-to-(noise + distortion) ratio performance versus input frequency for various ...

Page 10

AD7910/AD7920 1 2.35V 0.8 DD TEMP = 250kSPS 0.6 SAMPLE 0.4 0.2 0 –0.2 –0.4 –0.6 –0.8 –1.0 0 512 1024 1536 2048 2560 CODE TPC 5. AD7920 DNL Performance – 3.6V ...

Page 11

When the ADC starts a conversion (see Figure 5), SW2 opens and SW1 moves to position B, causing the comparator to become unbalanced. The control logic and charge redistribution DAC are used to add and subtract fixed amounts of charge ...

Page 12

AD7910/AD7920 Analog Input Figure 8 shows an equivalent circuit of the analog input structure of the AD7910/AD7920. The two diodes D1 and D2 provide ESD protection for the analog input. Care must be taken to ensure that the analog input ...

Page 13

Power-Down Mode This mode is intended for use in applications where slower through- put rates are required; either the ADC is powered down between each conversion series of conversions may be performed at a high throughput rate and ...

Page 14

AD7910/AD7920 the first SCLK edge the part receives after the falling edge of CS. This is shown as point A in Figure 11. Although at any SCLK frequency one dummy cycle is sufficient to power up the device and acquire ...

Page 15

SCLK SDATA Z ZERO ZERO THREE- 4 LEADING ZEROS STATE SCLK ZERO ZERO SDATA 4 LEADING ZEROS THREE-STATE SERIAL INTERFACE Figures 13 and 14 show ...

Page 16

AD7910/AD7920 MICROPROCESSOR INTERFACING The serial interface on the AD7910/AD7920 allows the part to be directly connected to a range of different microprocessors. This section explains how to interface the AD7910/AD7920 with some of the more common microcontroller and DSP serial ...

Page 17

AD7910/AD7920 to DSP563xx Interface The diagram in Figure 17 shows how the AD7910/AD7920 can be connected to the SSI (synchronous serial interface) of the DSP563xx family of DSPs from Motorola. The SSI is operated in Synchronous and Normal mode (SYN ...

Page 18

... PC via the Eval-Board Controller. The Eval-Board Controller can be used in conjunction with the evaluation board, as well as with many other Analog Devices evaluation boards ending in the CB designator, to demonstrate/evaluate the ac and dc performance of the ADC. ...

Page 19

BSC 1.00 0.90 0.70 0.10 MAX REV. 0 OUTLINE DIMENSIONS 6-Lead Plastic Surface-Mount Package [SC70] (KS-6) Dimensions shown in millimeters 2.00 BSC 2.10 BSC PIN 1 0.65 BSC 1.30 BSC 1.10 MAX 0.22 ...

Page 20

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