SPT5400 データシートの表示（PDF） - Cadeka Microcircuits LLC.

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SPT5400

13-BIT, OCTAL VOLTAGE-OUTPUT DAC WITH PARALLEL INTERFACE

Cadeka Microcircuits LLC. 

The relationship between the reference, AGNDxx and

output voltage is shown in table V.

Table V – Relationship between Reference, AGNDxx and Output

PARAMETER

BIPOLAR OPERATION

(AGNDxx = 0 V)

Bipolar Zero Level or Unipolar Mid-Scale

(Code = 1000000000000)

AGNDxx = 0 V

Differential Reference Voltage (VDR)

REFxx

Negative Full-Scale Output (Code = All 0s)

–REFxx

Positive Full-Scale Output (Code = All 1s) (4095/4096)(REFxx)

POSITIVE

UNIPOLAR OPERATION

(AGND = REFxx/2)

AGNDxx = REFxx/2

CUSTOM OPERATION

AGNDxx

REFxx/2

0V

(8191/8192)(REFxx)

REF – AGNDxx

AGNDxx – VDR

AGNDxx + (4095/4096)(VDR)

LSB Weight

VOUTxx as a Function of Digital Code

(D, 0 to 8191)

(REFxx/4096)

((D/4096)–1)(REFxx)

(REFxx/8192)

(D/8192)(REFxx)

(VDR/4096)

AGNDxx + ((D/4096)–1)(VDR)

Figure 2 – Typical Interface Circuit (shown for unipolar operation)

CMOS/TTL Control Source

C1

+A5 V

C1

-A5 V

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0 (LSB)

VDD

VDD

VSS

VSS

GND

FB

+

R

–

SPT5400

REFxx

C2

R

VOUTA

VOUTB

VOUTC

VOUTD

VOUTE

VOUTF

VOUTG

VOUTH

R

AGNDxx

C2

R

–

C2

Notes

R = 22 Ω

C1 = 1.0 µF

C2 = 0.1 µF

REF = 0 – VDD V

FB = Ferrite Bead

For Bipolar Operation

AGNDxx

+

REF

1 kΩ 1 kΩ

SPT5400

6

5/15/00

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