AD7869JN Analog Devices Inc, AD7869JN Datasheet

no-image

AD7869JN

Manufacturer Part Number
AD7869JN
Description
IC I/O PORT 14BIT ANLG 24-DIP
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD7869JN

Rohs Status
RoHS non-compliant
Applications
Analog I/O
Interface
TTL/CMOS
Voltage - Supply
4.75 V ~ 5.25 V
Package / Case
24-DIP (0.300", 7.62mm)
Mounting Type
Through Hole
Converter Type
ADC/DAC
Resolution
14b
Number Of Dac's
Single
Data Rate
0.083MSPS
Digital Interface Type
Serial
Pin Count
24
Package Type
PDIP
Lead Free Status / Rohs Status
Not Compliant
a
GENERAL DESCRIPTION
The AD7869 is a complete 14-bit I/O system containing a DAC
and an ADC. The ADC is a successive approximation type with
a track-and-hold amplifier, having a combined throughput rate
of 83 kHz. The DAC has an output buffer amplifier with a set-
tling time of 4 s to 14 bits. Temperature compensated 3 V bur-
ied Zener references provide precision references for the DAC
and ADC.
Interfacing to both the DAC and ADC is serial, minimizing pin
count and giving a small 24-pin package size. Standard control
signals allow serial interfacing to most DSP machines.
Asynchronous ADC conversion control and DAC updating is
made possible with the CONVST and LDAC logic inputs.
The AD7869 operates from 5 V power supplies; the analog in-
put/output range of the ADC/DAC is 3 V. The part is fully
specified for dynamic parameters such as signal-to-noise ratio
and harmonic distortion as well as traditional dc specifications.
The part is available in a 24-pin, 0.3 inch wide, plastic or her-
metic dual-in-line package (DIP) and in a 28-pin, plastic SOIC
package.
REV. A
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
Complete 14-Bit l/O System, Comprising
Operates from
Low Power—130 mW typ
Small 0.3" Wide DIP
APPLICATIONS
Digital Signal Processing
Speech Recognition and Synthesis
Spectrum Analysis
High Speed Modems
DSP Servo Control
14-Bit ADC with Track/Hold Amplifier
14-Bit DAC with Output Amplifier
On-Chip Voltage Reference
83 kHz Throughput Rate
3.5 s Settling Time
5 V Supplies
Complete, 14-Bit Analog I/O System
PRODUCT HIGHLIGHTS
1. Complete 14-Bit I/O System.
2. Dynamic Specifications for DSP Users.
3. Small Package.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
The AD7869 contains a 14-bit ADC with a track-and-hold
amplifier and a 14-bit DAC with output amplifier. Also in
cluded are separate on-chip voltage references for the DAC
and the ADC.
In addition to traditional dc specifications, the AD7869 is
specified for ac parameters, including signal-to-noise ratio
and harmonic distortion. These parameters, along with im-
portant timing parameters, are tested on every device.
The AD7869 is available in a 24-pin DIP and a 28-pin SOIC
package.
CONTROL
CONVST
LDAC
RCLK
TCLK
RFS
CLK
TFS
DR
DT
FUNCTIONAL BLOCK DIAGRAM
AD7869
DGND
CLOCK
World Wide Web Site: http://www.analog.com
ADC SERIAL
INTERFACE
INTERFACE
14 - BIT
SERIAL
14 - BIT
V
DAC
DAC
ADC
V
R
DD
SS
TRACK/HOLD
© Analog Devices, Inc., 1996
REFERENCE
REFERENCE
R
DAC 3V
ADC 3V
AD7869
AGND
R
LC
R
2
RO DAC
RO ADC
RI DAC
V
MOS
V
IN
OUT

Related parts for AD7869JN

AD7869JN Summary of contents

Page 1

FEATURES Complete 14-Bit l/O System, Comprising 14-Bit ADC with Track/Hold Amplifier 83 kHz Throughput Rate 14-Bit DAC with Output Amplifier 3.5 s Settling Time On-Chip Voltage Reference Operates from 5 V Supplies Low Power—130 mW typ Small 0.3" Wide ...

Page 2

AD7869–SPECIFICATIONS ( 5 ADC SECTION All specifications T Parameter 2 DYNAMIC PERFORMANCE 3, 4 Signal-to-Noise Ratio (SNR MIN MAX Total Harmonic Distortion (THD) Peak Harmonic or Spurious Noise Intermodulation ...

Page 3

V 5 DAC SECTION V Load to AGND OUT Parameter 2 DYNAMIC PERFORMANCE 3 Signal-to-Noise Ratio (SNR MIN MAX Total Harmonic Distortion (THD) Peak ...

Page 4

... Although the AD7869 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. Model AD7869JN AD7869JR AD7869AQ *N = Plastic DIP Cerdip Small Outline IC (SOIC). (V ...

Page 5

DIP Pin Number Mnemonic Function POWER SUPPLY 7 & Positive Power Supply & Negative Power Supply, – & 19 AGND Analog Ground. Both AGND pins must be tied together. ...

Page 6

AD7869 CONVERTER DETAILS The AD7869 is a complete 14-bit I/O port; the only external components required for normal operation are pull-up resistors for the ADC data outputs, and power supply decoupling capaci- tors. The AD7869 is comprised of a 14-bit ...

Page 7

REF OUT 100 50 OUTPUT WITH ALL 0s LOADED REF OUT DECOUPLED AS SHOWN IN 20 FIGURE 100 200 1k 2k FREQUENCY – Hz Figure 3. Noise Spectral Density vs. Frequency INPUT/OUTPUT TRANSFER FUNCTIONS A ...

Page 8

AD7869 TIMING AND CONTROL Communication with the AD7869 is managed by six dedicated pins. These consist of separate serial clocks, word framing or strobe pulses, and data signals for both receiving and transmit- ting data. Conversion starts and DAC updating ...

Page 9

AD7869 DYNAMIC SPECIFICATIONS The AD7869 is specified and 100% tested for dynamic perfor- mance specifications as well as traditional dc specifications such as Integral and Differential Nonlinearity. These ac specifications are required for signal processing applications such as speech recognition, ...

Page 10

AD7869 The digitizer sampling is synchronized with the DAC update rate to ease FFT calculations. The digitizer samples the DAC output after the output has settled to its new value. Therefore, if the digitizer were to directly sample the output, ...

Page 11

MICROPROCESSOR INTERFACING Microprocessor interfacing to the AD7869 is via a serial bus that uses standard protocol compatible with DSP machines. The communication interface consists of separate transmit (DAC) and receive (ADC) sections whose operations can be either syn- chronous or ...

Page 12

AD7869 AD7869–TMS32020 Interface Figure 18 shows an interface that is suitable for the TMS32020/ TMS320C25 processors. This interface is configured for syn- chronous, continuous clock operation. Note the AD7869 will not correctly interface to these processors if the AD7869 is ...

Page 13

ANALOG INPUT LK1 3V RANGE A B SKT1 C COMPONENT GRID COMPONENT GRID LK2 C SKT2 B A ANALOG OUTPUT 3V RANGE V + C10 0.1 F AD711 + IC3 V– C12 C11 0 ...

Page 14

AD7869 COMPONENT LIST IC1 AD7869 IC2, IC3 2X AD711 IC4, ADG201HS IC5, MC78L05 IC6, MC79L05 IC7, 74HC4050 IC8, 74HC221 C1, C3, C5, C7 C9, C11, C13, C15 10 F Capacitor C17, C19, C23 C2, C4, C6, C8 C10, C12, C14, ...

Page 15

Figure 22. Component Side Layout for the Circuit Diagram of Figure 19 Figure 23. Solder Side Layout for the Circuit Diagram of Figure 19 REV. A –15– AD7869 ...

Page 16

AD7869 24-Pin Plastic DIP (N-24) 1.275 (32.30) 1.125 (28.60 0.280 (7.11) 0.240 (6.10 0.060 (1.52) PIN 1 0.015 (0.38) 0.210 (5.33) MAX 0.200 (5.05) SEATING 0.022 (0.558) 0.100 0.070 (1.77) PLANE 0.125 (3.18) (2.54) 0.014 (0.356) ...

Related keywords