SP9316 datasheet(4/8 Pages) SIPEX

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SIGNAL PROCESSING EXCELLENCE

184

USING THE SP9316

General Configuration

The SP9316 can be configured for unipolar

voltage operation (2-quadrant multiplication)

or bipolar voltage operation (4-quadrant multi-

plication.) Coding is binary and offset binary

respectively. In bipolar operation both the ref-

erence signal and the number represented by the

digital input applied to the SP9316 may be of

either positive or negative polarity.

Pin 20 — MSB LATCH — MSB Latch control.

Level–triggered. Logic 0 strobes data into latch;

logic 1 allows data to update DAC directly.

Pin 21 — DB

16 — Data Bit 16 (LSB) .

Pin 22 — DB

15 — Data Bit 15.

Pin 23 — DB

14 — Data Bit 14.

Pin 24 — DB

13 — Data Bit 13.

PIN ASSIGNMENTS

Pin 1 — DB

12 — Data Bit 12.

Pin 2 — DB

11 — Data Bit 11.

Pin 3 — DB

10 — Data Bit 10.

Pin 4 — DB

9 — Data Bit 9.

Pin 5 — DB

8 — Data Bit 8.

Pin 6 — DB

7 — Data Bit 7.

Pin 7 — DB

6 — Data Bit 6.

Pin 8 — DB

5 — Data Bit 5.

Pin 9 — DB

4 — Data Bit 4.

Pin 10 — DB

3 — Data Bit 3.

Pin 11 — DB

2 — Data Bit 2.

Pin 12 — DB

1 — Data Bit 1 (MSB).

Pin 13 — V

REF In — Voltage Reference Input.

Pin 14 — R

FB — Feedback Resistor.

Pin 15 — I

OUT2 — Current Output.

Pin 16 — I

OUT1 — Inverted Current Output.

Pin 17 — VDD — +15V Power Supply.

Pin 18 — GND — Analog GND.

Pin 19 — LSB LATCH — LSB Latch control.

Level–triggered. Data is latched with strobe at

logic 0; logic 1 allows data to update DAC

directly.

FEATURES…

The SP9316 is a 16-bit, monolithic CMOS,

multiplying digital-to-analog converter with two

8-bit input registers for direct microprocessor

interface. It offers two– and four–quadrant mul-

tiplying capability with TTL/DTL and CMOS

logic compatibility. It is ideally suited for Auto-

mated Test Equipment, medical instrumenta-

tion and high–energy physics applications. Op-

erating from a single +15V supply, power dissi-

pation is less than 60mW. High accuracy and

monotonicity are achieved without laser–trim-

ming through the use of a highly accurate, low–

TCR thin–film resistor process. A unique digital

decoding technique of the 4 MSB’s results in

excellent linearity and stability over both time

and temperature. The SP9316 is packaged in

hermetic 24-pin ceramic or molded plastic.

Models are available for operation over the

commercial (0

°C to 70°C) and military (–55°C

to +125

°C) temperature ranges. For product

screened to MIL–STD–883, please consult the

factory.

Figure 1. Unipolar Operation

VREF

BIT 1 (MSB)

MSB LATCH

LSB LATCH

SP9316

400Ω

DIGITAL

INPUT

+15V

IOUT1

IOUT2

ROS

VOUT

All "ones":

VOUT = –VREF + 1LSB

0.01µF

1µF

RFB

BIT 16 (LSB)

GND

NOTE:

To maintain specified linearity, the external amplifier (A)

must be nulled. Apply an "all zeroes" digital input and adjust

ROS for VOUT = 0±1mV.

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