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AD7920AKSZ-REEL7

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
250 kSPS,
10-/12-Bit ADCs in 6-Lead SC70
AD7910/AD7920
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 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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved.
FEATURES
Throughput rate: 250 kSPS
Specified for V
DD
of 2.35 V to 5.25 V
Low power
3.6 mW typ at 250 kSPS with 3 V supplies
12.5 mW typ at 250 kSPS with 5 V supplies
Wide input bandwidth
71 dB SNR at 100 kHz input frequency
Flexible power/serial clock speed management
No pipeline delays
High speed serial interface
SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible
Standby mode: 1 μA max
6-lead SC70 package
8-lead MSOP package
APPLICATIONS
Battery-powered systems
Personal digital assistants
Medical instruments
Mobile communications
Instrumentation and control systems
Data acquisition systems
High speed modems
Optical sensors
FUNCTIONAL BLOCK DIAGRAM
T/H
CONTROL LOGIC
10-/12-BIT
SUCCESSIVE
APPROXIMATION
ADC
GND
V
DD
AD7910/AD7920
SDATA
SCLK
CS
V
IN
02976-001
Figure 1.
GENERAL DESCRIPTION
The AD7910/AD7920
1
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 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.
The reference for the part is taken internally from V
DD
. This
allows the widest dynamic input range to the ADC. Thus, the
analog input range for the part is 0 to V
DD
. The conversion rate
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. 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
converting. The part also features a power-down mode to
maximize power efficiency at lower throughput rates.
Current consumption is 1 μA maximum and 50 nA typically
when in power-down mode.
4. Reference derived from the power supply.
5. No pipeline delay. The parts feature a standard successive
approximation ADC with accurate control of the sampling
instant via a
CS
input and once-off conversion control.
1
Protected by U.S. Patent No. 6,681,332.
AD7910/AD7920
Rev. C | Page 2 of 24
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Product Highlights ........................................................................... 1
Specifications..................................................................................... 3
AD7910.......................................................................................... 3
AD7920.......................................................................................... 4
Timing Specifications .................................................................. 6
Timing Examples .............................................................................. 7
Timing Example 1 ........................................................................ 7
Timing Example 2 ........................................................................ 7
Absolute Maximum Ratings............................................................ 8
ESD Caution.................................................................................. 8
Pin Configurations and Function Descriptions ........................... 9
Typical Performance Characteristics ........................................... 10
Ter mi nol og y .................................................................................... 12
Circuit Information........................................................................ 13
Converter Operation...................................................................... 14
ADC Transfer Function............................................................. 14
Typical Connection Diagram ................................................... 14
Analog Input ............................................................................... 15
Digital Inputs .............................................................................. 15
Modes of Operation ....................................................................... 16
Normal Mode.............................................................................. 16
Power-Down Mode .................................................................... 16
Power-Up Time .......................................................................... 16
Power vs. Throughput Rate ........................................................... 18
Serial Interface ................................................................................ 19
Microprocessor Interfacing........................................................... 20
AD7910/AD7920 to TMS320C541 Interface ......................... 20
AD7910/AD7920 to ADSP-218x.............................................. 20
AD7910/AD7920 to DSP563xx Interface ............................... 21
Application Hints ........................................................................... 22
Grounding and Layout .............................................................. 22
Evaluating Performance ............................................................ 22
Outline Dimensions ....................................................................... 23
Ordering Guide .......................................................................... 24
REVISION HISTORY
9/05—Rev. B to Rev. C
Updated Formatting ..........................................................Universal
Updated Outline Dimensions....................................................... 23
Changes to Ordering Guide.......................................................... 24
3/04—Rev. A to Rev. B
Added U.S. Patent Number ............................................................ 1
Changes to Note 5 ............................................................................ 2
Changes to Note 6 of AD7920 Specifications............................... 4
Changes to Note 1 of Timing Specifications ................................ 4
Changes to Absolute Maximum Ratings ...................................... 6
Changes to Ordering Guide............................................................ 6
8/03—Rev. 0 to Rev. A
Changes to Ordering Guide.............................................................6
Changes to Evaluating the AD7910/AD7920 Performance
Section.............................................................................................. 18
Updated Outline Dimensions ...................................................... 19
AD7910/AD7920
Rev. C | Page 3 of 24
SPECIFICATIONS
AD7910
V
DD
= 2.35 V to 5.25 V, f
SCLK
= 5 MHz, f
SAMPLE
= 250 kSPS, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Table 1.
Parameter
1
A Grade
1, 2
Unit Test Conditions/Comments
DYNAMIC PERFORMANCE f
IN
= 100 kHz sine wave
Signal-to-Noise + Distortion (SINAD)
3
61 dB min
Total Harmonic Distortion (THD)
3
−72 dB max
Peak Harmonic or Spurious Noise (SFDR)
3
−73 dB max
Intermodulation Distortion (IMD)
3
Second-Order Terms −82 dB typ fa = 100.73 kHz, fb = 90.7 kHz
Third-Order Terms −82 dB typ fa = 100.73 kHz, fb = 90.7 kHz
Aperture Delay 10 ns typ
Aperture Jitter 30 ps typ
Full Power Bandwidth 13.5 MHz typ @ 3 dB
2 MHz typ @ 0.1 dB
DC ACCURACY
Resolution 10 Bits
Integral Nonlinearity ±0.5 LSB max
Differential Nonlinearity ±0.5 LSB max Guaranteed no missed codes to 10 bits
Offset Error
3, 4
±1 LSB max
Gain Error
3, 4
±1 LSB max
Total Unadjusted Error (TUE)
3, 4
±1.2 LSB max
ANALOG INPUT
Input Voltage Ranges 0 to V
DD
V
DC Leakage Current ±0.5 A max
Input Capacitance 20 pF typ Track-and-hold in track, 6 pF typ when in hold
LOGIC INPUTS
Input High Voltage, V
INH
2.4 V min
Input Low Voltage, V
INL
0.8 V max V
DD
= 5 V
0.4 V max V
DD
= 3 V
Input Current, I
IN
, SCLK Pin ± 0.5 A max Typically 10 nA, V
IN
= 0 V or V
DD
Input Current, I
IN
, CS Pin
± 10 nA typ
Input Capacitance, C
IN
5
5 pF max
LOGIC OUTPUTS
Output High Voltage, V
OH
V
DD
− 0.2 V min I
SOURCE
= 200 A, V
DD
= 2.35 V to 5.25 V
Output Low Voltage, V
OL
0.4 V max I
SINK
= 200 A
Floating-State Leakage Current ±1 A max
Floating-State Output Capacitance
5
5 pF max
Output Coding Straight (natural) binary
CONVERSION RATE
Conversion Time 2.8 s max 14 SCLK cycles with SCLK at 5 MHz
Track-and-Hold Acquisition Time
3
250 ns max
Throughput Rate 250 kSPS max
POWER REQUIREMENTS
V
DD
2.35/5.25 V min/max
I
DD
Digital I/Ps = 0 V or V
DD
Normal Mode (Static) 2.5 mA typ V
DD
= 4.75 V to 5.25 V, SCLK on or off
1.2 mA typ V
DD
= 2.35 V to 3.6 V, SCLK on or off
Normal Mode (Operational) 3 mA max V
DD
= 4.75 V to 5.25 V, f
SAMPLE
= 250 kSPS
1.4 mA max V
DD
= 2.35 V to 3.6 V, f
SAMPLE
= 250 kSPS
Full Power-Down Mode 1 A max Typically 50 nA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

AD7920AKSZ-REEL7

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Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 250 kSPS, 12- Bit
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