參數(shù)資料
型號(hào): MSM7584C
廠商: OKI SEMICONDUCTOR CO., LTD.
英文描述: π/4 Shift QPSK MODEM(π/4移動(dòng)QPSK調(diào)制解調(diào)器/ADPCM編碼譯碼器)
中文描述: π/ 4移位的QPSK調(diào)制解調(diào)器(π/ 4移動(dòng)的QPSK調(diào)制解調(diào)器/差分PcM編碼譯碼器)
文件頁(yè)數(shù): 19/57頁(yè)
文件大小: 321K
代理商: MSM7584C
Semiconductor
MSM7584C
19/57
+
RSSI signal
R2
R1
Gain = R2/R1
RSGAIN
RSSI
ADC
Control
register
CR19:B7 to B0
DC
ADJUST
Reference
voltage
generator
CR20:B7 to B3
S
Figure 7 RSSI-ADC Interface
(RSSI-ADC)
RSSI, RSGAIN
RSSI input and level adjustment.
RSSI is connected to the inverting input pin of the internal amplifier. RSGAIN is connected to
the output pin of the amplifier.
Adjust the gain and DC so that the signal amplitude is between 0.7 V and 2.1 V on the RSGAIN
pin. See Fig. 7 for connection.
Gain: A = R2/R1 = 1.4/ (Vmax - Vmin)
if R1 + R2
20 k
W
DC adjustment value : Vadj = A/(1+A)
((Vmax + Vmin) /2– 1.4)
Set the register CR20 to the DC adjustment value nearest to Vadj.
See the control register map (CR20) for setup values.
SGRS
Internal reference voltage output for the RSSI - ADC.
The output voltage is 2.0 V. Insert an approx. 0.1
m
F bypass capacitor between this pin and the
AGM pin.
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