AD7920BRMZ Analog Devices Inc, AD7920BRMZ Datasheet

IC ADC 12BIT 250KSPS 8-MSOP

AD7920BRMZ

Manufacturer Part Number
AD7920BRMZ
Description
IC ADC 12BIT 250KSPS 8-MSOP
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD7920BRMZ

Data Interface
DSP, MICROWIRE™, QSPI™, Serial, SPI™
Number Of Bits
12
Sampling Rate (per Second)
250k
Number Of Converters
1
Power Dissipation (max)
15mW
Voltage Supply Source
Single Supply
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Resolution (bits)
12bit
Sampling Rate
250kSPS
Input Channel Type
Differential
Supply Current
3mA
Digital Ic Case Style
SOP
No. Of Pins
8
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
EVAL-AD7920CBZ - BOARD EVALUATION FOR AD7920
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AD7920BRMZ
Manufacturer:
ADI/亚德诺
Quantity:
20 000
Part Number:
AD7920BRMZ-REEL7
Manufacturer:
AD
Quantity:
7 537
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 μA 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
GENERAL DESCRIPTION
The AD7910/AD7920
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
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.
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.
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
SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible
Personal digital assistants
Medical instruments
Mobile communications
DD
of 2.35 V to 5.25 V
1
are, respectively, 10-bit and 12-bit, high
DD
. The conversion rate
DD
. This
10-/12-Bit ADCs in 6-Lead SC70
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
PRODUCT HIGHLIGHTS
1.
2.
3.
4.
5.
1
Protected by U.S. Patent No. 6,681,332.
10-/12-bit ADCs in SC70 and MSOP packages.
Low power consumption.
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.
Reference derived from the power supply.
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.
V
IN
FUNCTIONAL BLOCK DIAGRAM
T/H
AD7910/AD7920
APPROXIMATION
CONTROL LOGIC
© 2005 Analog Devices, Inc. All rights reserved.
SUCCESSIVE
10-/12-BIT
ADC
GND
V
Figure 1.
DD
AD7910/AD7920
250 kSPS,
www.analog.com
SCLK
SDATA
CS

Related parts for AD7920BRMZ

AD7920BRMZ Summary of contents

Page 1

FEATURES Throughput rate: 250 kSPS Specified for 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 ...

Page 2

AD7910/AD7920 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 ...

Page 3

SPECIFICATIONS AD7910 MHz SCLK SAMPLE Table 1. 1 Parameter DYNAMIC PERFORMANCE 3 Signal-to-Noise + Distortion (SINAD) 3 Total Harmonic Distortion (THD) Peak Harmonic or Spurious Noise (SFDR) 3 ...

Page 4

AD7910/AD7920 1 Parameter 6 Power Dissipation Normal Mode (Operational) Full Power-Down 1 Temperature range from −40°C to +85°C. 2 Operational from V = 2.0 V, with input high voltage ( See the Terminology section. 4 SC70 values guaranteed ...

Page 5

Parameter LOGIC INPUTS Input High Voltage, V INH Input Low Voltage, V INL Input Current SCLK Pin IN Input Current Pin IN 6 Input Capacitance LOGIC OUTPUTS Output High Voltage ...

Page 6

AD7910/AD7920 TIMING SPECIFICATIONS MIN MAX Table 3. AD7910/AD7920 1 Parameter Limit MIN MAX SCLK × t ...

Page 7

TIMING EXAMPLES Figure 3 and Figure 4 show some of the timing parameters from Table 3. TIMING EXAMPLE 1 From Figure 4, having MHz and a throughput rate of SCLK 250 kSPS gives a cycle time of ...

Page 8

AD7910/AD7920 ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 4. Parameter V to GND DD Analog Input Voltage to GND Digital Input Voltage to GND Digital Output Voltage to GND Input Current to Any Pin Except Supplies ...

Page 9

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS AD7910/ AD7920 GND SDATA 2 5 TOP VIEW (Not to Scale) V SCLK Figure 5. 6-Lead SC70 Pin Configuration Table 5. Pin Function Descriptions Pin No. Pin ...

Page 10

AD7910/AD7920 TYPICAL PERFORMANCE CHARACTERISTICS Figure 7 and Figure 8 show a typical FFT plot for the AD7920 and AD7910, respectively 250 kSPS sampling rate and a 100 kHz input frequency. Figure 9 shows the signal-to-(noise + distortion) ratio ...

Page 11

V = 2.35V DD 0.8 TEMP = 25° 250kSPS SAMPLE 0.6 0.4 0.2 0 –0.2 –0.4 –0.6 –0.8 –1.0 0 512 1024 1536 2048 2560 CODE Figure 11. AD7920 DNL Performance – 3.6V DD –20 ...

Page 12

AD7910/AD7920 TERMINOLOGY Integral Nonlinearity 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 below the ...

Page 13

CIRCUIT INFORMATION The AD7910/AD7920 are fast, micropower, 10-bit/12-bit, single-supply A/D converters, respectively. The parts can be operated from a 2. 5.25 V supply. When operated from either supply supply, the AD7910/AD7920 ...

Page 14

AD7910/AD7920 CONVERTER OPERATION The AD7910/AD7920 are successive approximation analog-to- digital converters based around a charge redistribution DAC. Figure 14 and Figure 15 show simplified schematics of the ADC. Figure 14 shows the ADC during its acquisition phase. When SW2 is ...

Page 15

REF193 μ 1.2mA μ μ 0 TANT 680nF V DD AD7910/ AD7920 SCLK IN INPUT SDATA CS GND SERIAL INTERFACE Figure 17. REF193 as Power Supply Table 6 provides typical ...

Page 16

AD7910/AD7920 MODES OF OPERATION The mode of operation of the AD7910/AD7920 is selected by controlling the logic state of the CS signal during a conversion. There are two possible modes of operation, normal mode and power-down mode. The point at ...

Page 17

CS SCLK SDATA CS SCLK SDATA THE PART BEGINS TO POWER SCLK SDATA When power supplies are first applied to the AD7910/AD7920, the ADC can power up in either power-down mode or in normal mode. Because ...

Page 18

AD7910/AD7920 POWER VS. THROUGHPUT RATE By using the power-down mode on the AD7910/AD7920 when not converting, the average power consumption of the ADC decreases at lower throughput rates. Figure 22 shows how, as the throughput rate is reduced, the device ...

Page 19

SERIAL INTERFACE Figure 23 and Figure 24 show the detailed timing diagram for serial interfacing to the AD7920 and AD7910, respectively. The serial clock provides the conversion clock and also controls the transfer of information from the AD7910/AD7920 during conversion. ...

Page 20

AD7910/AD7920 MICROPROCESSOR INTERFACING The serial interface on the AD7910/AD7920 allows the parts 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 21

For example, the ADSP-2111 has a master clock frequency of 16 MHz. If the SCLKDIV register is loaded with the value 3, an SCLK of 2 MHz is obtained and eight master clock periods elapse for every one SCLK period. ...

Page 22

AD7910/AD7920 APPLICATION HINTS GROUNDING AND LAYOUT The printed circuit board that houses the AD7910/AD7920 should be designed such that the analog and digital sections are separated and confined to certain areas of the board. This facilitates the use of ground ...

Page 23

OUTLINE DIMENSIONS 2.20 2.00 1.80 2.40 1. 1.25 2. 1.80 1.15 PIN 1 0.65 BSC 1.30 BSC 1.00 0.40 1.10 0.90 0.10 0.80 0.70 0.30 0.10 MAX SEATING 0.15 PLANE 0.10 COPLANARITY COMPLIANT TO ...

Page 24

... AD7920BRM −40°C to +85°C AD7920BRM-REEL −40°C to +85°C AD7920BRM-REEL7 −40°C to +85°C 2 AD7920BRMZ −40°C to +85°C 2 AD7920BRMZ-REEL −40°C to +85°C 2 AD7920BRMZ-REEL7 −40°C to +85°C 3 EVAL-AD7910CB 3 EVAL-AD7920CB 4 EVAL-CONTROL BRD2 1 Linearity error refers to integral nonlinearity Pb-free part. 3 This can be used as a standalone evaluation board or in conjunction with the EVAL-CONTROL BRD2 for evaluation/demonstration purposes ...

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