參數(shù)資料
型號(hào)： S1M8657
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述： TX IF/BBA WITH AGC
中文描述： 德克薩斯州中頻/工商管理帶AGC
文件頁數(shù)： 21/34頁
文件大?。?/td> 281K
代理商： S1M8657
TX IF/BBA WITH AGC
S1M8657
21
The M in binary can be set by changing the PLLR1[7:5] register value. And normally, f
ERROR
is designed to the
limit of 1kHz.
[An example of a Lock length design ]
f
VCO
= 260.76MHz; f
TCXO
= 19.68MHz; f
ERROR
= 1kHz; R = 16, N = 212
f
R
= f
TCXO
/R = 19.68MHz/16 = 1.23MHz
fv = (f
VCO
+ f
ERROR
)/N = 1230004.71698
N
PD
= 2
×
T
TCXO
/(1/f
R
- 1/fv) = 32600
N
TCXO
= R
×
N
PD
= 16
×
32600 = 521600
M = Roundup{log
2
(N
TCXO
)} - 13 = Roundup(18.9926) - 13 = 6
Therefore. Lock detector length is 2
19
TCXO
.
General Purpose ADC
The GP-ADC for the system monitor has a built-in 3-input switch Serial 8-BIT A-D Converter and is used
generally used to sense the temperature, and battery amount and type. The GP-ADC can be controlled by the
following methods.
Parallel control as in the existing S1M8653B when the SPI is not used and SEN = low.
GPENA, GPDATA, and GPCLK must be used.
Basic and enhanced modes exist with SPI use when SEN = High
: Controlled through the SPI register and GPENA in the Basic Mode(TXMODE_CONT[0] = Low),
and can output through either the SPI register or GPDATA and GPCLK pins.
: Controlled according to the contents in the GPADC_MODE[7:0] in the Enhanced
Mode(TXMODE_CONT[0] = High).
General Purpose ADC Operation without SPI (SEN = low)
When SEN = low, the Serial BUS(SPI BUS) is not used. In such a case, GP-ADC is controlled through SLSB,
SMSB, GPENA, GPDATA and GPCLK provided from external pins or data must be sent. Under these
conditions, the GP-ADC is reset at the rising edge of GPENA from the modem and starts the conversion. The
converted digital code is synchronized to the continuous 9 GPCLK and sent to the modem. To start a new GP-
ADC conversion, GPENA must be at Low. Input range or signal are selected based on the SMSB/PAON and
SLSB/CLK states, as shown in Table 2.
Table 2. Input and Range Select (SEN = low)
SMSB
0
0
1
1
SLSB
0
1
0
1
GPIN
GPIN1
GPIN1
GPIN2
GPIN3
Vin MID
0.75V
1.5V
1.5V
1.5V
Input Range
0.5V
2V
2V
2V
LSB/Step
2mV
8mV
8mV
8mV
Zin
∞
∞
∞
∞
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