AD7880BRZ Analog Devices Inc, AD7880BRZ Datasheet

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AD7880BRZ

Manufacturer Part Number
AD7880BRZ
Description
IC ADC 12BIT MONO LP 24-SOIC
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD7880BRZ

Data Interface
Parallel
Number Of Bits
12
Sampling Rate (per Second)
66k
Number Of Converters
1
Power Dissipation (max)
50mW
Voltage Supply Source
Single Supply
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
24-SOIC (0.300", 7.50mm Width)
Resolution (bits)
12bit
Sampling Rate
66kSPS
Input Channel Type
Single Ended
Supply Voltage Range - Analog
4.75V To 5.25V
Supply Current
4mA
Digital Ic Case Style
SOIC
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AD7880BRZ
Manufacturer:
ADI
Quantity:
485
Part Number:
AD7880BRZ
Manufacturer:
ADI/亚德诺
Quantity:
20 000
a
GENERAL DESCRIPTION
The AD7880 is a high speed, low power, 12-bit A/D converter
which operates from a single +5 V supply. It consists of a 3 s
track/hold amplifier, a 12 s successive-approximation ADC,
versatile interface logic and a multiple-input-range circuit. The
part also includes a power save feature.
An internal resistor network allows the part to accept both uni-
polar and bipolar input signals while operating from a single
+5 V supply. Fast bus access times and standard control inputs
ensure easy interfacing to modern microprocessors and digital
signal processors.
The AD7880 features a total throughput time of 15 s and can
convert full power signals up to 33 kHz with a sampling fre-
quency of 66 kHz.
In addition to the traditional dc accuracy specifications such as
linearity, full-scale and offset errors, the AD7880 is also fully
specified for dynamic performance parameters including har-
monic distortion and signal-to-noise ratio.
The AD7880 is fabricated in Analog Devices’ Linear Compat-
ible CMOS (LC
that combines precision bipolar circuits with low power CMOS
logic. The part is available in a 24-pin, 0.3 inch-wide, plastic or
hermetic dual-in-line package (DIP) as well as a small 24-lead
SOIC package.
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
FEATURES
12-Bit Monolithic A/D Converter
66 kHz Throughput Rate
Low Power
70 dB SNR
Fast Data Access Time: 57 ns
Small 24-Lead SOIC and 0.3" DIP Packages
APPLICATIONS
Battery Powered Portable Systems
Digital Signal Processing
Speech Recognition and Synthesis
High Speed Modems
Control and Instrumentation
12 s Conversion Time
3 s On-Chip Track/Hold Amplifier
Power Save Mode: 2 mW typ
Normal Operation: 25 mW typ
2
MOS) process, a mixed technology process
Low Power, 12-Bit Sampling ADC
PRODUCT HIGHLIGHTS
1. Fast Conversion Time.
2. Low Power Consumption.
3. Multiple Input Ranges.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
12 s conversion time and 3 s acquisition time allow for
large input signal bandwidth. This performance is ideally
suited for applications in areas such as telecommunications,
audio, sonar and radar signal processing.
2 mW power consumption in the power-down mode makes
the part ideally suited for portable, hand held, battery pow-
ered applications.
The part features three user-determined input ranges, 0 V to
+5 V, 0 V to 10 V and 5 V. These unipolar and bipolar
ranges are achieved with a 5 V only power supply.
CONVST
CLKIN
AGND
BUSY
V
V
V
REF
RD
CS
INA
INB
LC
FUNCTIONAL BLOCK DIAGRAM
2
MOS Single +5 V Supply,
CONTROL
R
R
LOGIC
12-BIT DAC
COMPARATOR
DB11
BUFFERS
SAMPLING
THREE
STATE
DB0
+
COUNTER
SAR +
LOW POWER
CONTROL
AD7880
CIRCUIT
AD7880
DGND
V
DD
Fax: 617/326-8703
MODE

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AD7880BRZ Summary of contents

Page 1

FEATURES 12-Bit Monolithic A/D Converter 66 kHz Throughput Rate 12 s Conversion Time 3 s On-Chip Track/Hold Amplifier Low Power Power Save Mode typ Normal Operation typ 70 dB SNR Fast Data Access Time: 57 ...

Page 2

AD7880–SPECIFICATIONS Parameter B Versions 2 DYNAMIC PERFORMANCE 3 Signal-to-Noise Ratio (SNR) 70 Total Harmonic Distortion (THD) –80 Peak Harmonic or Spurious Noise –80 Intermodulation Distortion (IMD) Second Order Terms –80 Third Order Terms –80 DC ACCURACY Resolution 12 Integral Nonlinearity ...

Page 3

TIMING CHARACTERISTICS Limit at +25 C Parameter (All Versions 130 NOTES 1 Timing specifications ...

Page 4

AD7880 ORDERING GUIDE Full-Scale Temperature Error Model Range (LSBs) AD7880BN – + AD7880BQ – + AD7880CN – + AD7880CQ – + AD7880BR –40 C ...

Page 5

CIRCUIT INFORMATION The AD7880 single supply 12-bit A/D converter. The part requires no external components apart from a 2.5 MHz ex- ternal clock and power supply decoupling capacitors. It contains a 12-bit successive approximation ADC based ...

Page 6

AD7880 The AD7880 has two unipolar input ranges and Figure 5 shows the analog input for the range. The designed code transitions occur midway between ...

Page 7

500 – *ADDITIONAL PINS OMITTED FOR CLARITY Figure 11. Offset and Full-Scale Adjust Circuit Unipolar Adjustments In the case of the ...

Page 8

AD7880 12 11.5 11 10.5 SAMPLE FREQUENCY = 61kHz INPUT FREQUENCY – kHz Figure 13. Effective Number of Bits vs. Frequency Total Harmonic Distortion (THD) THD is the ratio of the rms sum ...

Page 9

MICROPROCESSOR INTERFACING The AD7880 high speed bus timing allows direct interfacing to real time digital signal processors, DSPs, as well as modern high speed, 16-bit microprocessors. Suitable microprocessor inter- faces are shown in Figures 15 through 20. AD7880–ADSP-2100 Interface Figure ...

Page 10

AD7880 a write operation starts a conversion. Data is read at the end of the conversion sequence as before. Figure 19 shows an example of initiating conversion using this method. A similar implemen- tation can be used for DSPs. Note ...

Page 11

APPLICATION HINTS Good printed circuit board (PCB) layout is as important as the circuit design itself in achieving high speed A/D performance. The AD7880’s comparator is required to make bit decisions on an LSB size of 1.22 mV. To achieve ...

Page 12

AD7880 as a function of time for such operation. The total conversion time for each cycle (where the time taken for a single conversion) corresponding to 1.65 10 Hence: Average Power = Power ...

Page 13

Figure 24. Data Acquisition Circuit Using the AD7880 REV. 0 Figure 25. PCB Silkscreen for Figure 24 –13– AD7880 ...

Page 14

AD7880 Figure 26. PCB Component Side Layout for Figure 24 Figure 27. PCB Solder Side Layout for Figure 24 –14– REV. 0 ...

Page 15

SEATING PLANE 0.419 (10.65) 0.394 (10.00) REV. 0 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 24-Lead Plastic DIP (N-24) 1.228 (31.19) 1.226 (31.14 0.260 (6. PIN 1 SEATING PLANE 0.02 (0.5) ...

Page 16

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