Document
AD7545
August 1997
12-Bit, Buffered, Multiplying CMOS DAC
Description
The AD7545 is a low cost monolithic 12-bit, CMOS multiplying DAC with on-board data latches. Data is loaded in a single 12-bit wide word which allows interfacing directly to most 12-bit and 16-bit bus systems. Loading of the input latches is under the control of the CS and WR inputs. A logic low on these control inputs makes the input latches transparent allowing direct unbuffered operation of the DAC.
Features
• 12-Bit Resolution • Low Gain T.C. 2ppm/oC (Typ) • Fast TTL/CMOS Compatible Data Latches • Single +5V to +15V Supply • Low Power • Low Cost • /883 Processed Versions Available
Ordering Information
PART NUMBER AD7545JN AD7545KN AD7545AN AD7545BN TEMP. RANGE (oC) 0 to 70 0 to 70 -40 to 85 -40 to 85 PACKAGE 20 Ld PDIP 20 Ld PDIP 20 Ld PDIP 20 Ld PDIP PKG. NO. E20.3 E20.3 E20.3 E20.3
Pinout
AD7545 (PDIP) TOP VIEW
Functional Diagram
RFB 20 AD7545 R OUT 1 AGND DGND 1 2 3 4 5 6 7 8 9 20 RFB 19 VREF 18 VDD 17 WR 16 CS 15 DB0 (LSB) 14 DB1 13 DB2 12 DB3 11 DB4 DB11 - DB0 (PINS 4 - 15) CS 16 12 WR 17 INPUT DATA LATCHES 3 DGND 12 18 VDD VREF 19 12-BIT MULTIPLYING DAC 1 2 OUT1 AGND
DB11 (MSB) DB10 DB9 DB8 DB7 DB6
DB5 10
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
File Number
3108.1
10-10
AD7545
Absolute Maximum Ratings
Supply Voltage (VDD to DGND) . . . . . . . . . . . . . . . . . . . -0.3V, +17V Digital Input Voltage to DGND . . . . . . . . . . . . . . . .-0.3V, VDD +0.3V VRFB , VREF to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±25V VPIN1 to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3V, VDD +0.3V AGND to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3V, VDD +0.3V
Thermal Information
Thermal Resistance (Typical, Note 1) θJA (oC/W) PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125 Maximum Junction Temperature (PDIP Package) . . . . . . . . . 150oC Maximum Storage Temperature Range . . . . . . . . . .-65oC to 150oC Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC
Operating Conditions
Temperature Ranges Commercial (J, K, Grades) . . . . . . . . . . . . . . . . . . . . .0oC to 70oC Industrial (A, B, Grades) . . . . . . . . . . . . . . . . . . . . . -40oC to 85oC Extended (S Grades) . . . . . . . . . . . . . . . . . . . . . . -55oC to 125oC
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE: 1. θJA is measured with the component mounted on an evaluation PC board in free air.
Electrical Specifications
PARAMETER STATIC PERFORMANCE Resolution Relative Accuracy J, A, S K, B Differential Nonlinearity
TA = See Note 2, VREF = +10V, VOUT1 = 0V, AGND = DGND, Unless Otherwise Specified VDD = +5V TEST CONDITIONS MIN TYP MAX MIN VDD = +15V TYP MAX UNITS
12 ±2 ±1 ±4 ±1 ±20 ±10
12 ±2 ±1 ±4 ±1 ±25 ±15
Bits LSB LSB LSB LSB LSB LSB
J, A, S 10-Bit Monotonic TMIN to TMAX K, B 12-Bit Monotonic TMIN to TMAX J, A, S DAC Register Loaded with 1111 1111 1111 K, B Gain Error is Adjustable Using the Circuits of Figures 4 and 5 (Note 3) Typical Value is 2ppm/oC for VDD = +5V (Note 4) ∆VDD = ±5% J, K A, B S DB0 - DB11 = 0V; WR, CS = 0V (Note 2)
Gain Error (Using Internal RFB)
Gain Temperature Coefficient ∆Gain/∆Temperature DC Supply Rejection ∆Gain/∆VDD Output Leakage Current at OUT1
0.015 -
-
±5 0.03 50 50 200
0.01 -
-
±10 0.02 50 50 200
ppm/oC % nA nA nA µs
DYNAMIC CHARACTERISTICS Current Setting Time To 1/2 LSB, OUT1 LOAD = 100Ω , DAC Output Measured from Falling Edge of WR, CS = 0V (Note 4) 2 2
Propagation Delay from Digital Input OUT1 LOAD = 100Ω, Change to 90% of Final Analog CEXT = 13pF (Notes 4 and 5) Output Digital to Analog Glitch Impulse AC Feedthrough at OUT1 ANALOG OUTPUTS Output Capacitance COUT1 COUT1 DB0 - DB11 = 0V, WR, CS = 0V (Note 4) DB0 - DB11 = VDD , WR, CS = 0V (Note 4) VREF = AGND VREF = ±10V, 10kHz Sinewave (Note 6)
-
-
300
-
-
250
ns
-
400 5
-
-
250 5
-
nV/s mVP-P
-
-
70 200
-
-
70 200
pF pF
10-11
AD7545
Electrical Specifications
PARAMETER REFERENCE INPUT Input Resistance (Pin 19 to GND) Input Resistance TC = -300ppm/oC (Typ) Typical Input Resistance = 11kΩ DIGITAL INPUTS Input High Voltage, VIH Input Low Voltage, VIL Input Current, IIN Input Capacitance DB0 - DB11 WR, CS VIN = 0 or VDD (Note 7) VIN = 0 (Note 4) VIN = 0 (Note 4) 2.4 ±1 0.8 ±10 7 20 ±1 13.5 1.5 ±10 7 20 V V µA (Max) pF pF 7 25 7 25 kΩ kΩ TA = See Note 2, VREF = +10V, VOUT1 = 0V, AGND = DGND, Unless Otherwise Specified (Continued) VDD = +5V TEST CONDITIONS MIN TYP MAX MIN VDD = +15V TYP MAX UNITS
SWITCHING CHARACTERISTICS (Note 4) Chip Select to Write Setup Ti.