数据搜索系统,热门电子元器件搜索 |
|
STV8203 数据表(PDF) 22 Page - STMicroelectronics |
|
STV8203 数据表(HTML) 22 Page - STMicroelectronics |
22 / 31 page AGCS (AGC Control and Status for ADC) Address : 12 Type : R/W Reset : 0100 00XX bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 0 AGC-ERR SIG-OVR SIG-UND AGC-ERR : Gain Control Signal of amplifier before ADC. There are 32 steps of 1.25dB. AGC-ERR [6:2] Gain (dB) 00000 0 00001 1.25 ..... ..... 11110 37.50 11111 38.75 When AGC_CMD = 0, AGC-ERR can be read thus indicating the input level. It can also be written to thus presetting the AGC level which will then adjust itself to the final value. When AGC_CMD = 1, the AGC is off and thus writing to AGC-ERR directly controls the AGC amplifier gain. Reading AGC_ERR just confirms the fixed value. SIG-OVR SIG-UND : 1 = agc overloaded - signal too BIG 1 = agc under loaded - signal too SMALL When the AGC is in automatic mode (agc_cmd=0), bit 0 indicates if the input signal is too small and bit 1 if the AGC is too big. These bits could be used when setting the input level to the STV8203. IAGCR (Internal AGC Reference for QPSK) Address : 14 Type : R/W Reset : 1000 1000 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 IAGC-REF Sets the mean value of the internal AGC, used for QPSK demodulation. The default setting corresponds to half full scale amplitude at the PLL input. IAGCC (Internal AGC Time Constant for QPSK) Address : 15 Type : R/W Reset : 0000 0011 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 IAGC-OFF 0000 IAGC-CST IAGC-OFF : 1 = Internal agc = off Only enabled when AUTOSTANDARD is off. Normally , the internal AGC should be OFF for FM and ON for QPSK. This bit is controlled by AUTOSTANDARD when this function is activated. IAGC-CST : Internal AGC Programmable Step Constant. Set the internal AGC time constant; the compromise is between fast settling time (for the quickest Nicam identification) and noise immunity. The control range is about 45dB divided into 0.2dB steps. These bits control the time per step (values given for QPSK mode) : AGC-CST [2:0] Step time ( µs) Time Response (ms) 000 703 105 001 352 53 ..... ..... ..... 111 5.5 0.82 PROGRAMMING THE DEVICE (continued) STV8203 22/31 |
类似零件编号 - STV8203 |
|
类似说明 - STV8203 |
|
|
链接网址 |
隐私政策 |
ALLDATASHEETCN.COM |
ALLDATASHEET是否为您带来帮助? [ DONATE ] |
关于 Alldatasheet | 广告服务 | 联系我们 | 隐私政策 | 链接交换 | 制造商名单 All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |