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DAC7802K Schematic ( PDF Datasheet ) - Burr-Brown Corporation

Teilenummer DAC7802K
Beschreibung Dual Monolithic CMOS 12-Bit Multiplying DIGITAL-TO-ANALOG CONVERTERS
Hersteller Burr-Brown Corporation
Logo Burr-Brown Corporation Logo 




Gesamt 12 Seiten
DAC7802K Datasheet, Funktion
® DAC7800
DAC7801
DAC7802
Dual Monolithic CMOS 12-Bit Multiplying
DIGITAL-TO-ANALOG CONVERTERS
FEATURES
q TWO D/As IN A 0.3" WIDE PACKAGE
q SINGLE +5V SUPPLY
q HIGH SPEED DIGITAL INTERFACE:
Serial—DAC7800
8 + 4-Bit Parallel—DAC7801
12-Bit Parallel—DAC7802
q MONOTONIC OVER TEMPERATURE
q LOW CROSSTALK: –94dB min
q FULLY SPECIFIED OVER –40OC TO +85OC
APPLICATIONS
q PROCESS CONTROL OUTPUTS
q ATE PIN ELECTRONICS LEVEL SETTING
q PROGRAMMABLE FILTERS
q PROGRAMMABLE GAIN CIRCUITS
q AUTO-CALIBRATION CIRCUITS
DESCRIPTION
The DAC7800, DAC7801 and DAC7802 are mem-
bers of a new family of monolithic dual 12-bit CMOS
multiplying digital-to-analog converters. The digital
interface speed and the AC multiplying performance
are achieved by using an advanced CMOS process
optimized for data conversion circuits. High stability
on-chip resistors provide true 12-bit integral and dif-
ferential linearity over the wide industrial temperature
range of –40oC to +85oC.
DAC7800 features a serial interface capable of clock-
ing-in data at a rate of at least 10MHz. Serial data is
clocked (edge triggered) MSB first into a 24-bit shift
register and then latched into each D/A separately or
simultaneously as required by the application. An
asynchronous CLEAR control is provided for power-
on reset or system calibration functions. It is packaged
in a 16-pin 0.3" wide plastic DIP.
DAC7801 has a 2-byte (8 + 4) double-buffered
interface. Data is first loaded (level transferred) into
the input registers in two steps for each D/A. Then
both D/As are updated simultaneously. DAC7801 fea-
tures an asynchronous CLEAR control. DAC7801 is
packaged in a 24-pin 0.3" wide plastic DIP.
DAC7802 has a single-buffered 12-bit data word in-
terface. Parallel data is loaded (edge triggered) into the
single D/A register for each D/A. DAC7802 is pack-
aged in a 24-pin 0.3" wide plastic DIP.
DAC7802
12 12-Bit Interface
DAC7801
8 8-Bit Interface
8 Bits + 4 Bits
Serial
DAC7800
Serial Interface
VREF A
12 12-Bit MDAC
DAC A
RFB A
IOUT A
AGND A
VREF B
12 12-Bit MDAC
DAC B
RFB B
IOUT B
AGND B
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
© 1990 Burr-Brown Corporation
PDS-11079G
DAC7800Pr,int0ed1in,U0.S.2A. January, 1998
®






DAC7802K Datasheet, Funktion
DAC7801 (CONT)
TIMING CHARACTERISTICS
VDD = +5V, VREF A = VREF B = +10V, TA = –40°C to +85°C.
PARAMETER
t1 — Address Valid to Write Setup Time
t2 — Address Valid to Write Hold Time
t3 — Data Setup Time
t4 — Data Hold Time
t5 — Chip Select or Update to Write Setup Time
t6 — Chip Select or Update to Write Hold Time
t7 — Write Pulse Width
t8 — Clear Pulse Width
MINIMUM
10ns
10ns
30ns
10ns
0ns
0ns
40ns
40ns
A0–A1
DATA
CS, UPD
WR
CLR
t1 t2
t3 t4
t5 t6
t7
5V
0V
5V
0V
5V
0V
5V
0V
t8
5V
0V
NOTES: (1) All input signal rise and fall times are measured from 10% to 90% of +5V. tR = tF = 5ns. (2) Timing measurement reference level is
VIH + V IL
2.
DAC7802
BLOCK DIAGRAM
VDD
21
DAC7802
CS A 5
CS B 20
WR 19
12
CK DAC A Register
12
DAC A
DAC B
12
CK DAC B Register
12
2 IOUT A
3 RFB A
4 VREF A
22 VREF B
23 RFB B
24 IOUT B
1 AGND
12
DGND
18 6
DB11–DB0
LOGIC TRUTH TABLE
CSA
X
1
CSB
X
1
01
10
00
X = Don’t care.
WR FUNCTION
1 No Data Transfer
X No Data Transfer
0 A Rising Edge on CSA or CSB Loads
Data to the Respective DAC
DAC A Register Loaded from Data Bus
DAC B Register Loaded from Data Bus
DAC A and DAC B Registers Loaded
from Data Bus
means rising edge triggered.
PIN CONFIGURATION
AGND 1
IOUT A
RFB A
V REF A
CS A
2
3
4
5
(LSB) DB0 6
DB1 7
DB2 8
DB3 9
DB4 10
DB5 11
DGND 12
DAC7802
Top View
DIP
24 I OUT B
23 RFB B
22 V REF B
21 V DD
20 CS B
19 WR
18 DB11 (MSB)
17 DB10
16 DB9
15 DB8
14 DB7
13 DB6
TIMING CHARACTERISTICS
At VDD = +5V, and TA = –40oC to +85oC.
PARAMETER
t1 - Data Setup Time
t2 - Data Hold Time
t3 - Chip Select to Write Setup Time
t4 - Chip Select to Write Hold Time
t5 - Write Pulse Width
MINIMUM
20ns
15ns
30ns
0ns
30ns
DATA
CSA, CSB
WR
t1
t3
t5
t2
t4
5V
0V
5V
5V
NOTES: (1) All input signal rise and fall times are measured from 10%
to 90% of +5V. tR = tF = 5ns. (2) Timing measurement reference level
VIH + V IL
is 2 .
®
DAC7800, 01, 02
6

6 Page









DAC7802K pdf, datenblatt
+10V
CD
1µF
+15V
+5V
VDD
2
6 REF102
4
VREF A
RFB A
DAC A
IOUT A
AGND A
C1
10pF
A1
DAC780X
DAC B
RFB B
IOUT B
AGND B
C2
10pF
A2
R
R
2
R
3
R
1
6
INA105
±10V
13 Bits
DGND
VREF B
FIGURE 8. 13-Bit Bipolar DAC.
DAC7802 has a single analog common, AGND.
A1 OPA602 or 1/2 OPA2107.
f C Adjust
VREF 2
DAC 2
VREF 1
DAC 1
DAC780X
Filter Input
VREF 3
DAC 3
IOUT 3
AGND 3
12
1/2 DAC780X
Gain Adjust
3
R
R = 50k ±0.5%
C = 1000pF ±0.5%
2
IOUT 2
AGND 2
IOUT 1
AGND 1
High-Pass Out
13 8
R
R
Band-Pass
Out
7 14
C
Q Adjust
VREF 4
RFB 4
DAC 4
IOUT 4
AGND 4
1/2 DAC780X
Low-Pass
Out
15
C
6
R
UAF 42
11 4
FIGURE 9. Digitally Programmable Universal Active Filter.
®
DAC7800, 01, 02
12

12 Page





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