參數(shù)資料
型號(hào)： HD49334A
廠商： Renesas Technology Corp.
英文描述： CDS/PGA & 10-bit A/D Converter
中文描述： 的CDS /美國(guó)PGA
文件頁(yè)數(shù)： 14/23頁(yè)
文件大?。?/td> 242K
代理商： HD49334A
HD49334AF/AHF
Rev.1.0, Apr 20, 2004, page 14 of 22
Explanation of Serial Data of CDS Part
Serial data of CDS part has the following functions.
PGA gain (D5 to D12 of register 0)
Details are referred to page 5 block diagram.
At CDS_in mode: –2.36 dB + 0.132 dB
×
N (Log linear)
At ADC_in mode: 0.57 times + 0.01784 times
×
N (Times linear)
: Full-scale digital output is defined as 0 dB when 1 V is input.
Above PGA gain definition means input signal 1 Vp-p to CDS_in, and set N = 18 (correspond 2.36 dB), and then
PGA outputs the 2 V full-range, and also ADC out puts the full code (1023).
This mean offset gain of PGA has 6 dB – 2.36 dB = 3.64 dB, therefore it should be decided that how much dB add
on.
(1) Level dia explain
CDS
PGA
0 dB when set N = 18 which correspond to 2.36 dB
ADC
(2) Level dia on the circuit
CDS
PGA
3.64 dB + 0.132 dB
×
N
(CDS = 0 dB)
ADC
2 V
1023
(1.0 V)
(1.0 V)
(2.0 V)
(1023)
Figure 9 Level Dia of PGA
CSEL (D15 of register 0)
Data = 0: Select CDSIN
Data = 1: Select ADCIN
Address
STD1[7:0] (L)
STD2[15:8] (H)
1
1
1
1
0
0
0
1
D4
D3
D2
D1
D0 D15 D14 D13 D12 D11 D10 D9
D8
SHA_fsel
test_I2
SHSW_fsel
t
M
L
S
S
SLP and STBY (D3, D4 of register 1)
SLP:
Stop the all circuit. Consumption current of CDS part is less than 10
μ
A.
Start up from offset calibration when recover is needed.
STBY: Only the standard voltage generating circuit is operated. Consumption current of CDS part is about 3 mA.
Allow 50 H time for feedback clamp is stabilized until recover.
Output mode (D5 to D7 of register 1 and D4 of register 3)
It is a test mode. Combination details are table 3 to 5. Normally set to all 0.
SHA-fsel (D8 to D9 of register 1)
It is a LPF switching of SH amplifier. Frequency characteristics are referred to page 9. To get rough idea, set the
double cut off frequency point with using.
SHSW-fsel (D10 to D13 of register 1)
It is a time constant which sampling the black level of SH amplifier. Frequency characteristics are referred to page
9. 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.
相關(guān)PDF資料
PDF描述
HD49334AF CDS/PGA & 10-bit A/D Converter
HD49335F CDS/PGA AND 10-bit A/D TG Converter
HD49335HF CDS/PGA AND 10-bit A/D TG Converter
HD49338F CDS/PGA & 12-bit A/D Converter
HD49338HF CDS/PGA & 12-bit A/D Converter
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HD49334AF 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:CDS/PGA & 10-bit A/D Converter
HD49334AHNP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:CDS/PGA & 10-bit A/D Converter
HD49334ANP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:CDS/PGA & 10-bit A/D Converter
HD49335F 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:CDS/PGA AND 10-bit A/D TG Converter
HD49335HF 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:CDS/PGA AND 10-bit A/D TG Converter
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