LTC2753_15 datasheet(10/24 Pages) LINER

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LTC2753

2753f

PIN FUNCTIONS

RCOM (Pin 1): Center Tap Point for the Reference Inverting

Resistors. The 20k reference inverting resistors R1 and R2

are connected internally from RIN to RCOM and from RCOM

to REFA, respectively (see Block Diagram). For normal

operation tie RCOM to the negative input of the external

reference inverting ampliﬁer (see Typical Applications).

RIN (Pin 2): Input Resistor R1 of the Reference Inverting

Resistors. The 20k resistor R1 is connected internally from

RIN to RCOM. For normal operation tie RIN to the external

reference voltage VREF. Typically 5V; accepts up to ±15V.

S2 (Pin 3): Span I/O Bit 2. Pins S0, S1 and S2 are used

to program and to read back the output ranges of the

DACs.

IOUT2A (Pin 4): DAC A Current Output Complement. Tie

IOUT2A to ground.

GND (Pin 5): Shield Ground, provides necessary shielding

for IOUT2A. Tie to ground.

D3-D11 (Pins 6-14): LTC2753-12 Only. DAC Input/Output

Data Bits. These I/O pins set and read back the DAC code.

D11 is the MSB.

D5-D13 (Pins 6-14): LTC2753-14 Only. DAC Input/Output

Data Bits. These I/O pins set and read back the DAC code.

D13 is the MSB.

D7-D15 (Pins 6-14): LTC2753-16 Only. DAC Input/Output

Data Bits. These I/O pins set and read back the DAC code.

D15 is the MSB.

VDD (Pin 15): Positive Supply Input 2.7V ≤ VDD ≤ 5.5V.

Requires a 0.1μF bypass capacitor to GND.

NC (Pin 16): No Internal Connection.

A1 (Pin 17): DAC Address Bit 1. See Table 3.

A0 (Pin 18): DAC Address Bit 0. See Table 3.

GND (Pin 19): Ground. Tie to ground.

CLR (Pin 20): Asynchronous Clear. When CLR is taken

to a logic low, the data registers are reset to the zero-volt

code for the present output range (VOUT = 0V).

MSPAN (Pin 21): Manual Span Control Pin. MSPAN is used

to conﬁgure the LTC2753 for operation in a single, ﬁxed

output range. When conﬁgured for single-span operation,

the output range is set via hardware pin strapping. The

input and DAC registers of the span I/O port are transparent

and do not respond to write or update commands.

To conﬁgure the part for single-span use, tie MSPAN directly

to VDD. If MSPAN is instead connected to GND (SoftSpan

conﬁguration), the output ranges are set and veriﬁed by

using write, update and read operations. See Manual Span

Conﬁguration in the Operation section. MSPAN must be

connected either directly to GND (SoftSpan conﬁguration)

or VDD (single-span conﬁguration).

D0-D2 (Pins 22-24): LTC2753-12 Only. DAC Input/Output

Data Bits. These I/O pins set and read back the DAC code.

D0 is the LSB.

D0-D4 (Pins 22-26): LTC2753-14 Only. DAC Input/Output

Data Bits. These I/O pins set and read back the DAC code.

D0 is the LSB.

D0-D6 (Pins 22-28): LTC2753-16 Only. DAC Input/Output

Data Bits. These I/O pins set and read back the DAC code.

D0 is the LSB.

NC (Pins 25-30): LTC2753-12 Only. No Internal Connection.

NC (Pins 27-30): LTC2753-14 Only. No Internal Connection.

NC (Pins 29, 30): LTC2753-16 Only. No Internal Con-

nection.

GND (Pin 31): Shield Ground, provides necessary shielding

for IOUT2B. Tie to ground.

IOUT2B (Pin 32): DAC B Current Output Complement. Tie

IOUT2B to ground.

S0 (Pin 33): Span I/O Bit 0. Pins S0, S1 and S2 are used to

program and to read back the output range of the DACs.

D/S (Pin 34): Data/Span Select. This pin is used to select

the data I/O pins or the span I/O pins (D0 to D15 or S0

to S2, respectively), along with their respective dedicated

registers, for write or read operations. Update operations

ignore D/S, since all updates affect both data and span

registers. For single-span operation, tie D/S to ground.

READ (Pin 35): Read Pin. When READ is asserted high,

the data I/O pins (D0-D15) or span I/O pins (S0-S2)

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