TPIC83000IPWRQ1 datasheet(5/44 Pages) TI

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VDIO

= (V

– VOS – (TCVOS2 × Temp) – (TCVOS2 × Temp ) ×

digital

input

Gain × (1 + (TC

× Temp))

Gain1

VccA × 1024

TPIC83000-Q1

www.ti.com

SLDS171 – NOVEMBER 2009

Principles of Operation

The system transfer equation is shown in Equation 1.

(1)

Where

Vinput = Voltage input to the Logic (DSP) block. This voltage is the same as the output of the Analog Front

End

VDIOdigital = Digital output of the logic (DSP) block

Temp = Difference between ambient temperature and room temperature

VOS = Offset adjust

TCVOS1 = Offset TC1 adjust

TCVOS2 = Offset TC2 adjust

Gain = Gain

TCGain1 = Gain TC1 adjust

VccA = ADC reference

VDIOdigital = 0 for lower clamp (TA = –40°C to 85°C)

VDIOdigital = 1023 for upper clamp (TA = –40°C to 85°C)

The range and resolution of the parameters is given in Table 1.

Table 1. Output Parameters

ADJUSTMENT

DECIMAL

BINARY

ADJUSTMENT

ITEM

SYMBOL

BIT NO.

DEFAULT

RANGE

VALUE

511

111111111

+120 mV

Input coarse offset

TRVOSC

±120 mV

0 mV

256

100000000

0 mV

-120 mV

255

11111111

4 × 510

μV

Input fine offset

TRVOSF

0 to 4 × 510

μV

1111111

(+25

μV/°C) × 3

Input offset first-order

temperature

TRTCVOS1

(±25

μV/°C) × 3

μV/°C

coefficient

-64

10000000

(-25

μV/°C) × 3

Input offset

1111111

40 nV/°C2

second-order

TRTCVOS2

±40 nV/°C2

μV/°C2

temperature

-64

10000000

-40 nV/°C2

coefficient

255

1111111

125%

Gain

TRGAIN

100 + 25%

100%

-255

10000000

75%

Gain first-order

0 ppm/°C

temperature

TRTCGAIN1

-900 to 0 ppm/°C

0 ppm/°C

-63

-900 ppm/°C

coefficient

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