HD155121F Datasheet, PDF (25/57 Pages) Hitachi Semiconductor – RF Transceiver IC for GSM and PCN Dual band cellular systems

HD155121F
LNA Bias Circuit Typical Performance
Bias current [mA]
= (Vb − Va) / 10Ω
6 17 18 32 38 41 42 43
V_CC = 3.0V
b
a
for GSM
b
a
for PCN
no fit 10p
3
10
POONRX1 44
+−
POONRX2 45
4
4.7k
10p
no fit
Active bias
circuit
10
POONTX 46
+−
BAND 35
LE 28
SDATA 27
5
CLK 26
4.7k
7 19 31 37 40
High
High
Low
High for PCN
Low for GSM
all bit = 0 (no care)
TRS: Siemens ^10p
BFP420
Unit: R : Ω
C:F
Figure 4
Bias current vs. V_CC and Temperature
6.4
Operating voltage range ^{Ta=−40°C}
Ta=−25°C
6.2
Ta=27°C
Ta=85°C
6.0
Ta=100°C
5.8
5.6
5.4
5.2
5.0
2
2.5
3
3.5
4
4.5
V_CC (V)
25