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參數(shù)資料
| 型號(hào)： | MC44871DTB |
| 廠商： | MOTOROLA INC |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | PLL TUNING CIRCUIT WITH HIGH SPEED I2C BUS AND 30 V TUNING SUPPLY |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO16 |
| 封裝： | PLASTIC, TSSOP-16 |
| 文件頁數(shù)： | 4/12頁 |
| 文件大?。?/td> | 198K |
| 代理商： | MC44871DTB |
MC44871
4
MOTOROLA ANALOG IC DEVICE DATA
PIN FUNCTION DESCRIPTION (see Figure 1)
Pin
Symbol
Description
1
VTUN
CP
Operational amplifier output which provides the tuning voltage
2
DC–DC Converter output (Charge Pump)
3, 4
HF1, HF2
Symmetrical HF inputs
5
Gnd
Ground
6, 7, 8
B2, B1, B0
PNP Band Buffer outputs
9
B4
NPN Band Buffer output
10
ADC
Three bit ADC for Automatic Frequency Tuning, readable through the bus
11
VCC
ADD
Positive supply of the circuit (5.0 V)
12
Chip address function
I2C bus Data Input/Output
I2C bus Clock
13
SDA
14
SCL
15
Xtal
Crystal Oscillator (3.2 MHz or 4.0 MHz)
16
Amp In
Operational amplifier input
HF INPUT SENSITIVITY AND OVERLOAD CHARACTERISTICS
(VCC = 5.0 V, TA = 25
°
C.) (See Figure 2.)
Characteristics
Pin
Min
Typ
Max
Unit
Type
DC Bias (Internal)
3, 4
–
1.6
–
V
A
80–150 MHz
3, 4
10
–
315
mVrms
C
150–600 MHz
3, 4
5.0
–
315
mVrms
C
600–950 MHz
3, 4
10
–
315
mVrms
C
950–1300 MHz
3, 4
50
–
315
mVrms
C
50
Cable
Figure 2. HF Sensitivity Test Circuit
NOTE
:
1.Device is in test mode. B1, B2 are “On” and B0, B4 are “Off”.
Sensitivity is level of HF generator on 50
load.
13
14
HF1
3
Gnd
5
B0
8
B1
7
B2
6
B4
9
Bus Controller
HF Generator
HF Out
Gnd
11
4
VCC = 5.0 V
Counter
In
1.0 k
50
1.0 nF
MC44871
1.0 nF
1.0 k
1.0 k
Guaranteed Sensitivity Performance
R
FREQUENCY (MHz)
Figure 3. Typical HF Sensitivity Performance
(VCC = 5.0 V, Temperature = 25
°
C)
10
0
–10
–20
–30
–40
–50
–60
0
200
400
600
800
1000
1200
1400
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