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參數(shù)資料
| 型號： | GC1012A-CQ |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | DIGITAL TUNER CHIP |
| 中文描述： | 數(shù)字調(diào)諧器芯片 |
| 文件頁數(shù)： | 6/30頁 |
| 文件大?。?/td> | 186K |
| 代理商： | GC1012A-CQ |
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GRAYCHIP,INC.
- 1 -
FEBRUARY 18, 1998
GC1012A DIGITAL TUNER
DATA SHEET REV 0.1
This document contains information which may be changed at any time without notice
GC1012A DATASHEET
1.0
FUNCTIONAL DESCRIPTION
Fabricated in high speed CMOS technology, the GC1012A chip is an all digital tuner which can
downconvert and band limit signals from wide band digitized sources. At full rate operation (80 MHz input
rate), the input bandwidth can be up to 40 MHz wide. Any signal within the input bandwidth can be
down-converted to zero frequency, low pass filtered, and output at a reduced sample rate. The chips output
can be formatted as either a complex data stream, or as a real data stream. The complex samples are
output at rates equal to F
O
=F
CK
/D, where F
O
is the output rate, D is 1, 2, 4, 8, 16, 32 or 64 and F
CK
is the
input sample (clock) rate. The real output rates are F
O
=2F
CK
/D for D equal to 2, 4, 8, 16, 32, or 64.
The signal is low pass filtered to remove out of band energy before the sample rate is decreased.
The filters out of band rejection is over 75 dB and its passband ripple is less than 0.2 dB peak to peak. The
passband of the output filter covers 80% of the output bandwidth.
The 28 bit accumulator in the chips digital oscillator circuit provides a tuning accuracy equal to the
input clock rate divided by 2
28
. The tuning resolution at a clock rate of 50 MHz is less than 0.2 Hz giving a
tuning accuracy of +/- 0.1 Hz. The phase noise in the oscillator is low enough to provide a spur free dynamic
range of over 75 dB.
The chips output circuit allows the user to select a real or complex data output format, to select
spectral inversion, or to offset the output spectrum by half of the output sample rate. The outputs signal gain
can be adjusted in 0.03 dB steps. The word size of the output samples are either 10, 12, 14, or 16 bits.
On chip diagnostic circuits are provided to simplify system debug and maintenance.
The chip receives configuration and control information over a microprocessor compatible bus
consisting of an 8 bit data I/O port, a 4 bit address port, a read/write bit, and a control select strobe.
I and Q output registers can be read from the control port to allow an external processor to monitor
or process the chips output samples. These registers are valuable for monitoring the chips output power
in order to set and adjust gain levels.
1.1
KEY FEATURES
￥
80 million samples per second input rate
￥
0.1 Hz tuning resolution
￥
>75 dB dynamic range
￥
Programmable output bandwidth
￥
12 bit inputs, 10, 12, 14, or 16 bit outputs
￥
Real or complex output formats
￥
Built in strobe/sync generator
￥
Symmetric rounding used throughout
￥
Gain adjust in 0.03 dB steps
￥
Microprocessor
output, and diagnostics
interface
for
control,
￥
Power down mode
￥
Auto power down with clock loss detection
￥
Built in diagnostics
￥
3.25W power at 50 MHz, 5 volts
￥
850 mW at 30 MHz, 3.3 volts
￥
120 pin quad flat pack package
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| GC1012A-PQ | 制造商:TI 制造商全稱:Texas Instruments 功能描述:DIGITAL TUNER CHIP |
| GC1012B | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3.3V DIGITAL TUNER CHIP |
| GC1012B_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3.3V DIGITAL TUNER CHIP |
| GC1012B-PQ | 功能描述:調(diào)諧器 Sgl channel WB DDC RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度: |
| GC1012B-PQA | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3.3V DIGITAL TUNER CHIP |
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