HD49335F/HF

Rev.1.0, Feb.25.2004, page 19 of 29

• Output mode (D2 to D4 of address H’F1 and address H’F4 of D6)

It is a test mode. Combination details are table 3 to 5. Normally set to all 0.

• SHA-fsel (D8 to D9 of address H’F1)

It is a LPF switching of SH amplifier. Frequency characteristics are referred to page 8. To get rough idea, set the

double cut off frequency point with using.

• SHSW-fsel (D10 to D13 of address H’F1)

It is a time constant which sampling the black level of SH amplifier. Frequency characteristics are referred to page

8. To get rough idea, set the double cut off frequency point with using. S/N changes by this data, so find the

appropriate point with set data to up/down.

• Test_I2 (D14 to D15 of address H’F1)

Current of ADC analog part can be set minutely. Normally use data = 0.

0: Default (100%)

1: 150%

2: 50%

3: 80%

Address

STD1[7:0] (L)

HGain-Nsel

STD2[15:8] (H)

1

1

1

1

0

0

1

0

D4

D3

D2

D1

D0 D15 D14 D13 D12 D11 D10 D9

D8

Clamp level

HGstop-Hsel

• Clamp (D0 to D4 of address H’F2)

Determine the OB part level with digital code of ADC output.

Clamp level = setting data

× 2 + 14

Default data is 9 = 32 LSB.

• HGstop-Hsel, HGain-Nsel (D8 to D11 of address H’F2)

Determine the lead-in speed of OB clamp. Details are referred to page 7. PGA gain need to be changed for switch

the high speed leading mode. Transfer the gain +1/–1 to previous field, its switch to high speed leading mode.

• Low_PWR (D12 of address H’F2)

Switch circuit current and frequency characteristic.

Data = 0: 36 MHz guarantee

Data = 1: 25 MHz guarantee

• ADSEL (D14 of address H’F2)

Data = 0: Select CDS_in

Data = 1: Select ADC_in

• Reset (D15 of address H’F2)

Software reset.

Data = 1: Normal

Data = 0: Reset

Offset calibration should be done when starting up with using this bit. Details are referred to page 23.

Address

STD1[7:0] (L)

STD2[15:8] (H)

11110011

D4

D3

D2

D7

D6

D5

D1

D0 D15 D14 D13 D12 D11 D10 D9

D8

• Address H'F3 are all testing data.

Normally set to all 0., or do not transfer the data.