ADM8840ACP Просмотр технического описания (PDF) - Analog Devices

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ADM8840ACP

Charge Pump Regulator & COM Driver for Color TFT Panel

Analog Devices 

ADM8840

PRELIMINARY TECHNICAL DATA

DAC1 Setup

The resolution of DAC1 is 4.7mV this is scaled up by 6 to

give COM_OUT amplitude resolution of 28mV (4.7mV *

6 = 28mV). The COM_OUT amplitude Vp-p is given by,

(Binary Code/255)(1.188)(6)= Vp-p (COM_OUT).

A table of the min, max and typical values for COM_OUT

amplitude is given in the Table 1 below.

DAC2 Setup

The resolution of DAC2 is 4.7mV this is scaled up by 3 to

give you the COM_OUT centre voltage resolution of

14mV (4.7mV * 3 = 14mV). The COM_OUT centre

voltage is given by,

(Binary Code/255)(1.188)(3)= COM_OUT DC Voltage.

A table of the min, max and typical values for COM_OUT

centre voltage is given in the Table 2 below.

Table 1 COM_OUT amplitude Voltage

COM_OUT amplitude voltage

(Max) 7.016V

6.9882

.........

(Typ) 6.0098V

..........

4.0531V

(Min) 4.0025V

Binary Bits written to DAC1

11111011

11111010

.............

11010111

.............

10010001

10010000

Integer

251

250

.....

215

.....

145

144

COM_OUT centre voltage

(Max)

(Typ)

(Min)

2.8092V

2.7952V

...........

1.5094V

...........

0.9224V

0.9084V

Table 2 COM_OUT centre voltage

Binary Bits written to DAC2

Integer

11001001

201

11001000

200

..............

......

01101100

108

..............

......

01000010

66

01000001

65

DAC1_IN Voltage

1.667V

1.6623

...........

1.0011V

...........

671.7mV

667mV

DAC2_IN Voltage

933mV

928mV

..........

503.9mV

..........

304.7mV

300mV

–8–

REV. PrG 2/03

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