GM47/GM48 INTEGRATOR’S MANUAL

DAC

100 - 200pF 100k

DGND

DAC

10nF

1nF

 

1k

 

DGND

Load A

Load B

Figure 2.9 DAC loads

2.14.2 Analogue to Digital Converters 1, 2 and 3 - ADCx

The ADC is an 8-bit converter. An analogue value applied to any of the ADC pins is converted and stored in a register inside the module. When the appropriate AT command is received by the module, the digital value stored in the register is read.

ADC electrical characteristics are shown in the table below.

Parameter

Min.

Max.

Units

 

 

 

 

Resolution

8

8

Bits

 

 

 

 

Input voltage for 0000 0000 word

Input voltage for 1111 1111 word

Differential Non-Linearity (DNL) Overall Non-Linearity (INL) Absolute accuracy

Input impedance

Average supply current (continuous conversion)

External source impedance

0

0.01 x 2.75a

V

0.99 x 2.75a

2.75a

V

 

±0.75

LSB

 

±0.60

LSB

 

±1.5

LSB

1

 

M

 

1

mA

 

50

k

a. Tolerance on this internal voltage is ±5%

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LZT 123 7263 R1C

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Sony Ericsson GM48, GM47 manual DAC loads