mc44871 Freescale Semiconductor, Inc, mc44871 Datasheet - Page 4

• Manufacturer Part Number: mc44871
• Description: Tuning Circuit With High Speed Tuning Supply
• Manufacturer: Freescale Semiconductor, Inc

HF INPUT SENSITIVITY AND OVERLOAD CHARACTERISTICS
NOTE:
4
DC Bias (Internal)
Bus Controller
HF Generator
HF Out Gnd
6, 7, 8
V CC = 5.0 V
3, 4
80–150 MHz
150–600 MHz
600–950 MHz
950–1300 MHz
Pin
10
11
12
13
14
15
16
1
2
5
9
1. Device is in test mode. B1, B2 are “On” and B0, B4 are “Off”.
1.0 nF
Sensitivity is level of HF generator on 50
Figure 2. HF Sensitivity Test Circuit
50
Ç Ç Ç Ç Ç Ç Ç Ç
Ç Ç Ç Ç Ç Ç Ç Ç
Ç Ç Ç Ç Ç Ç Ç Ç
Cable
B2, B1, B0
HF1, HF2
Symbol
Amp In
11
4
V TUN
ADC
V CC
ADD
SDA
Gnd
SCL
Xtal
HF1
CP
B4
3
1.0 nF
50
Characteristics
Bus
Gnd
5
MC44871
B0
8
1.0 k
Operational amplifier output which provides the tuning voltage
DC–DC Converter output (Charge Pump)
Symmetrical HF inputs
Ground
PNP Band Buffer outputs
NPN Band Buffer output
Three bit ADC for Automatic Frequency Tuning, readable through the bus
Positive supply of the circuit (5.0 V)
Chip address function
I 2 C bus Data Input/Output
I 2 C bus Clock
Crystal Oscillator (3.2 MHz or 4.0 MHz)
Operational amplifier input
13
B1
7
1.0 k
14
PIN FUNCTION DESCRIPTION (see Figure 1)
B2
6
1.0 k
load.
B4
9
Counter
In
MC44871
3, 4
3, 4
3, 4
3, 4
3, 4
Pin
(V CC = 5.0 V, T A = 25 C.) (See Figure 2.)
–10
–20
–30
–40
–50
–60
10
Description
0
0
Figure 3. Typical HF Sensitivity Performance
Min
5.0
10
10
50
–
200
(V CC = 5.0 V, Temperature = 25 C)
MOTOROLA ANALOG IC DEVICE DATA
Guaranteed Sensitivity Performance
400
Typ
1.6
–
–
–
–
FREQUENCY (MHz)
600
Max
315
315
315
315
800
–
1000
mVrms
mVrms
mVrms
mVrms
Unit
V
1200
Type
1400
A
C
C
C
C