LTC1597AIN(RevA) 查看數據表（PDF） - Linear Technology

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LTC1597AIN
(Rev.:RevA)

14-Bit and 16-Bit Parallel Low Glitch Multiplying DACs with 4-Quadrant Resistors

Linear Technology 

LTC1591/LTC1597

PIN FUNCTIONS

LTC1591

REF (Pin 1): Reference Input and 4-Quadrant Resistor R2.

Typically ±10V, accepts up to ±25V. In 2-Quadrant mode

this is the reference input. In 4-quadrant mode, this pin is

driven by external inverting reference amplifier.

RCOM (Pin 2): Center Tap Point of the Two 4-Quadrant

Resistors R1 and R2. Normally tied to the inverting input

of an external amplifier in 4-quadrant operation, otherwise

shorted to the REF pin. See Figures 1a and 2a.

R1 (Pin 3): 4-Quadrant Resistor R1. In 2-quadrant opera-

tion short to the REF pin. In 4-quadrant mode tie to ROFS

(Pin 4).

ROFS (Pin 4): Bipolar Offset Resistor. Typically swings

±10V, accepts up to ±25V. In 2-quadrant operation tie to

RFB. In 4-quadrant operation tie to R1.

RFB (Pin 5): Feedback Resistor. Normally tied to the output

of the current to voltage converter op amp. Swings to

±VREF. VREF is typically ±10V.

IOUT1 (Pin 6): DAC Current Output. Tie to the inverting

input of the current to voltage converter op amp.

AGND (Pin 7): Analog Ground. Tie to ground.

LD (Pin 8): DAC Digital Input Load Control Input. When LD

is taken to a logic high, data is loaded from the input

register into the DAC register, updating the DAC output.

WR (Pin 9):DAC Digital Write Control Input. When WR is

taken to a logic low, data is loaded from the digital input

pins into the 14-bit wide input register.

DB13 to D2 (Pins 10 to 21): Digital Input Data Bits.

DGND (Pin 22): Digital Ground. Tie to ground.

VCC (Pin 23): The Positive Supply Input. 4.5V ≤ VCC ≥ 5.5V.

Requires a bypass capacitor to ground.

DB1, DB0 (Pins 24, 25): Digital Input Data Bits.

NC (Pins 26, 27): No Connect.

CLR (Pin 28):Digital Clear Control Function for the DAC.

When CLR is taken to a logic low, it sets the DAC output

and all internal registers to zero code for the LTC1591 and

midscale code for the LTC1591-1.

LTC1597

REF (Pin 1): Reference Input and 4-Quadrant Resistor R2.

Typically ±10V, accepts up to ±25V. In 2-Quadrant mode

this is the reference input. In 4-quadrant mode, this pin is

driven by external inverting reference amplifier.

RCOM (Pin 2): Center Tap Point of the Two 4-Quadrant

Resistors R1 and R2. Normally tied to the inverting input

of an external amplifier in 4-quadrant operation, otherwise

shorted to the REF pin. See Figures 1b and 2b.

R1 (Pin 3): 4-Quadrant Resistor R1. In 2-quadrant opera-

tion short to the REF pin. In 4-quadrant mode tie to ROFS

(Pin 4).

ROFS (Pin 4): Bipolar Offset Resistor. Typically swings

±10V, accepts up to ±25V. In 2-quadrant operation tie to

RFB. In 4-quadrant operation tie to R1.

RFB (Pin 5): Feedback Resistor. Normally tied to the output

of the current to voltage converter op amp. Swings to

±VREF. VREF is typically ±10V.

10

IOUT1 (Pin 6): DAC Current Output. Tie to the inverting

input of the current to voltage converter op amp.

AGND (Pin 7): Analog Ground. Tie to ground.

LD (Pin 8): DAC Digital Input Load Control Input. When LD

is taken to a logic high, data is loaded from the input

register into the DAC register, updating the DAC output.

WR (Pin 9):DAC Digital Write Control Input. When WR is

taken to a logic low, data is loaded from the digital input

pins into the 16-bit wide input register.

DB15 to D4 (Pins 10 to 21): Digital Input Data Bits.

DGND (Pin 22): Digital Ground. Tie to ground.

VCC (Pin 23): The Positive Supply Input. 4.5V ≤ VCC ≥ 5.5V.

Requires a bypass capacitor to ground.

DB3 to DB0 (Pins 24 to 27): Digital Input Data Bits.

CLR (Pin 28):Digital Clear Control Function for the DAC.

When CLR is taken to a logic low, it sets the DAC output

and all internal registers to zero code for the LTC1597 and

midscale code for the LTC1597-1.

15917fa

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