LTC2704IGW-16#PBF【PDF 22/22 页】IC DAC 16BIT QUAD VOUT 44-SSOP

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Sheet目录2006

18页 19页 20页 21页 [22页]

LTC2704

2704fd

CS/LD (Pin 10): Synchronous Chip Select and Load Pin.

SDI (Pin 11): Serial Data Input. Data is clocked in on the

rising edge of the serial clock when CS/LD is low.

SRO (Pin 12): Serial Readback Data Output. Data is clocked

out on the falling edge of SCK. Readback data begins

clocking out after the last address bit A0 is clocked in.

SCK (Pin 13): Serial Clock.

CLR (Pin 14): Asynchronous Clear Pin. When this pin is

low, all code and span B2 registers are cleared to zero.

All DAC outputs are cleared to zero volts.

RFBD (Pin 16): DAC D Voltage Output Feedback Resis-

tor Pin.

OUTD (Pin 17): DAC D Voltage Output Pin. For best load

regulation, this open-loop amplier output is connected

to RFBD as close to the load as possible.

C1D (Pin 18): Feedback Capacitor Connection for DAC

D Output. This pin provides direct access to the negative

input of the channel D output amplier.

VOSD (Pin 19): Offset Adjust for DAC D. Nominal input

range is ±5V. VOS(DAC D) = –0.01 V(VOSD) [0V to 5V,

±2.5V modes]. See Operation section.

AGNDD (Pin 20): DAC D Signal Ground. High impedance

input, does not carry supply currents. Tie to clean analog

ground.

REFG2 (Pin 21): Reference 2 Ground. High impedance

input, does not carry supply currents. Tie to clean analog

ground.

REFM2 (Pin 23): Reference 2 Inverting Amp Output. The

gain from REF2 to REFM2 is –1. Can swing to within 0.5V

of the analog supplies V+/V–.

REF2 (Pin 24): DAC C and DAC D Reference Input.

V+2 (Pin 25): Analog Positive Supply for DACs C and D.

Typically 15V. 4.5V to 16.5V Range. Can be different from

V+1.

AGNDC (Pin 26): DAC C Signal Ground. High impedance

input, does not carry supply currents. Tie to clean analog

ground.

VOSC (Pin 27): Offset Adjust for DAC C. Nominal input

range is ±5V. VOS(DAC C) = –0.01 V(VOSC) [0V to 5V,

±2.5V modes]. See Operation section.

C1C (Pin 28): Feedback Capacitor Connection for DAC C

Output. This pin provides direct access to the negative

input of the channel C output amplier.

OUTC (Pin 29): DAC C Voltage Output Pin. For best load

regulation, this open-loop amplier output is connected

to RFBC as close to the load as possible.

RFBC (Pin 30): DAC C Output Feedback Resistor Pin.

AGND (Pin 32):

Analog Ground Pin. Tie to clean analog

ground.

GND (Pin 33): Ground Pin. Tie to clean analog ground.

VDD (Pin 34): Logic Supply. 2.7V to 5.5V Range.

RFLAG (Pin 35): Reset Flag Pin. An active low output is

asserted when there is a power on reset or a clear event.

Returns high when an update command is executed.

RFBB (Pin 37): DAC B Output Feedback Resistor Pin.

OUTB (Pin 38): DAC B Voltage Output Pin. For best load

regulation, this open-loop amplier output is connected

to RFBB as close to the load as possible.

C1B (Pin 39): Feedback Capacitor Connection for DAC B

Output. This pin provides direct access to the negative

input of the channel B output amplier.

VOSB (Pin 40): Offset Adjust for DAC B. Nominal input

range is ±5V. VOS(DAC B) = –0.01 V(VOSB) [0V to 5V,

±2.5V modes]. See Operation section.

AGNDB (Pin 41): DAC B Signal Ground. High impedance

input, does not carry supply currents. Tie to clean analog

ground.

V+1 (Pin 42): Analog Positive Supply for DACs A DND

B. Typically 15V. 4.5V to 16.5V Range. Can be different

from V+2.

REF1 (Pin 43): DAC A and DAC B Reference Input.

REFM1 (Pin 44): Reference 1 Inverting Amp Output. The

gain from REF1 to REFM1 is –1. Can swing to within 0.5V

of the analog supplies V+/V–.

PIN FUNCTIONS

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