2

UCC391

MSOP-8, TSSOP-8 (TOP VIEW)

P, PW Packages

ABSOLUTE MAXIMUM RATINGS

Input Voltage, D0, D1, D2, D3, D4 . . . . . . . . . . . . . . . . . . . . 8V

Currents are positive into, negative out of the specified termi-

nal. Consult Packaging Section of Databook for thermal limita-

tions and considerations of packages. All voltages are

referenced to GND.

GND

D4

D3

COMMAND

D1

D2

D0

VCC

1

2

3

4

8

7

6

5

CONNECTION DIAGRAMS

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Supply Current Section

Supply Current, On

1.8

mA

DAC Reference Section

COMMAND Voltage Accuracy

–1.00

1.00

%

D0 – D4 Voltage High

4.5

5

5.5

V

D0 – D4 Voltage Threshold

2.5

V

D0 – D4 Input Bias Current

V(D4, D3, D2, D1, D0) < 0.5V

–90

–20

Output Current (Maximum Load)

0

150

Note 1: Reference and output amplifier offsets are trimmed out before packaging.

GND: (Ground) All voltages measured with respect to

ground. VCC should be bypassed directly to GND with a

0.1

µF or larger ceramic capacitor.

VCC: (Positive supply voltage) This pin is normally con-

nected to a 5V

± 10% system voltage. Bypass VCC di-

rectly to GND with a 0.1

µF (minimum) ceramic capacitor.

COMMAND: This pin is the output of the IC. It is con-

trolled by the 5-bit input word (D0:D4). This output will

have a

±1% system accuracy over temperature, process,

and input voltage.

D0, D1, D2, D3, D4: These are the digital input control

codes for the DAC. The DAC is comprised of two ranges

set by D4, with D0 representing the least significant bit

(LSB) and D3, the most significant bit (MSB). A bit is set

low by being connected to GND; a bit is set high by float-

ing the pin. Each control pin is pulled up to approximately

5V by an internal pull-up. If all ones are commanded on

the DAC inputs (no CPU command), the output will be

disabled.

PIN DESCRIPTIONS