- 您现在的位置：买卖IC网 > PDF目录98194 > TDA7326D (STMICROELECTRONICS) PLL FREQUENCY SYNTHESIZER, 140 MHz, PDSO16 PDF资料下载
参数资料
| 型号： | TDA7326D |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 140 MHz, PDSO16 |
| 封装： | SO-16 |
| 文件页数： | 12/16页 |
| 文件大小： | 1133K |
| 代理商： | TDA7326D |
2.0 GENERAL DESCRIPTION
This circuit contains a frequency synthesizer and
a loop filter for an FM and AM radio tuning sys-
tem. Only a VCO is required to build a complete
PLL system.
For FM and SW application, the counter works in
a two stages configuration.
The first stage is a swallow counter with a four
modulus (:32/33/64/65) precounter.
The second stage is an 8-bit programmable
counter.
For LW and MW application, a 14-bit programma-
ble counter is available.
The circuit receives the scaling factors for the pro-
grammable counters and the values of the refer-
ence frequencies via a three line serial bus inter-
face.
The reference frequency is generated by a 4MHz
XTAL oscillator followed by the reference divider.
An external oscillator (f = 4MHz) can be used in-
stead of the internal one; it must be connected to
OSCIN (pin 7).
The reference step-frequency is 1 or 2.5kHz for
AM. For FM mode a step frequency of 12.5 and
25kHz can be selected.
The circuit checks the format of the received data
words.
Valid data in the interface shift register are stored
automatically in buffer registers at the end of
transmission.
The output signals of the phase detector are
switching the programmable current sources.
Their currents are integrated in the loop filter to a
DC voltage.The values of the current sources are
programmable by two bits also received via the
serial bus.
The loop filter amplifier is supplied by a separate
positive power supply, to minimize the noise in-
duced by the digital part of the system.
The loop gain can be set for different conditions.
After a power on reset, all registers are reset to
zero and the standby mode is activated.
In standby mode, oscillator, reference counter,
AM input and FM input are stopped. The power
consumption is reduced to a minimum.
3.0 DETAILED DESCRIPTION OF THE PLL
FREQUENCY SYNTHESIZER
3.1 INPUT AMPLIFIERS
The signals applied on AM and FM input are am-
plified to get a logic level in order to drive the fre-
quency dividers.
3.1.1 Input Impedance
The typical input impedance: for the FM input
is 200
and for AM input is 1.4k.
3.1.2 Input sensitivity
(see Figures 1a and 1b).
3.2 DATA AND CONTROL REGISTER
3.2.1 Register Location
The data registers (bit2...bit7) for the control
register and the data registers PC7...PC0,
SC5...SC0 for the counters are organized in
four words, identified by two address bits (bit 7
and bit 6), bit 7 is the first bit to be sent by the
controller, bit0 is the last one. The order and
the number of the bytes to be transmitted is
free of choice. The modification of the
PC7...PC0 registers is valid for the internal
counters only after transmission of byte 4
(SC5...SC0).
ADDRESS BITS
DATA BITS
BYTE
MSB-BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
LSB BIT 0
Function
adr 0
adr 1
data 0
data 1
data 2
data 3
data 4
data 5
byte 1
0
test 0
test 1
test 2
SOUT
CURR2
fREF
byte 2
0
1
PC7
PC6
LPF1/2
CURR 1
SWM/DIR
AM/FM
byte 3
1
0
PC5
PC4
PC3
PC2
PC1
PC0
byte 4
1
SC5
SC4
SC3
SC2
SC1
SC0
3.2.2 CONTROL AND STATUS REGISTERS
Register Configuration
REGISTER NAME
FUNCTION
SWM/DIR
Swallow direct-mode switch 1 = SWM, 0 = DIR
AM/FM
AM - FM band switch 1=AM, 0 = FM
fREF
Selection of reference frequency (see table 3.4)
CURR1
Current select of change pump
CURR2
Current select of change pump
LPF1/LPF2
Loop filter input select 1= IPF1, 0 = IPF2
SOUT
Switch output condition 1=output high, 0 = output low
TDA7326
5/16
相关PDF资料 |
PDF描述 |
|---|---|
| TDA7333 | SPECIALTY CONSUMER CIRCUIT, PDSO16 |
| TDA7335 | SPECIALTY CONSUMER CIRCUIT, PDIP30 |
| TDA7338D | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
| TDA7338D013TR | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
| TDA7339D | 2 CHANNEL(S), TONE CONTROL CIRCUIT, PDSO28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TDA7330 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:SINGLE CHIP RDS DEMODULATOR + FILTER |
| TDA7330B | 功能描述:音频 DSP RDS Demodulator RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
| TDA7330BD | 功能描述:音频 DSP RDS Demodulator RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
| TDA7330BDTRC | 制造商:STMicroelectronics 功能描述: |
| TDA7331 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:SINGLE CHIP RDS DEMODULATOR+ FILTER |
发布紧急采购，3分钟左右您将得到回复。