LTC2662 datasheet(16/28 Pages) AD

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LTC2662

Rev 0

For more information www.analog.com

OPERATION

The LTC2662 is a family of five-channel, current source

output digital-to-analog converters (DACs) with select-

able output ranges, precision reference and a high-voltage

multiplexer (MUX) for surveying the channel output volt-

ages and currents. Each output draws its current from a

separate dedicated positive supply pin that accepts volt-

ages of 2.85V to 33V, allowing optimization of power dis-

sipation and headroom for a wide range of loads. Internal

12Ω switches allow any output pin to be connected to an

optional negative V– supply voltage and sink up to 80mA.

Power-On-Reset

The outputs reset to a high-impedance state on power up,

making system initialization consistent and repeatable.

After power-on initialization, select the output range via

SPI bus using Tables 1, 2 and 3.

Power Supply Sequencing and Start-Up

The supplies (VCC, IOVCC, V+, V– and VDD0 to VDD4) may

be powered up in any convenient order. If an external

reference is used, do not allow the input voltage at REF to

rise above VCC + 0.3V during supply turn-on and turn-off

sequences (see the Absolute Maximum Ratings section).

After start-up, IOVCC should be within VCC; and no supply

should exceed V+. DC reference voltages of 1.225V to

1.275V are acceptable.

Supply bypassing is critical to achieving the best possible

performance. Use at least 1µF of low-ESR capacitance to

ground on all supply pins and locate as close to the device

as possible. A 0.1µF capacitor may be used for IOVCC.

Table 1. Command Codes

COMMAND

Write Code to n

Write Code to All

Write Span to n

Write Span to All

Update n (Power Up)

Update All (Power Up)

Write Code to n, Update n (Power Up)

Write Code to n, Update All (Power Up)

Write Code to All, Update All (Power Up)

Power Down n

Power Down Chip

Monitor Mux

Toggle Select

Global Toggle

Config Command

No Operation

Table 2. DAC Addresses, n

ADDRESS

DAC 0

DAC 1

DAC 2

DAC 3

DAC 4

Note: Any DAC address code used other than the codes

given above in Table 2 will cause the command to be

ignored.

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