- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄361728 > VES1993 (NXP SEMICONDUCTORS) Single Chip Satellite Channel Receiver(單片衛(wèi)星頻道接收器) PDF資料下載
參數(shù)資料
| 型號(hào)： | VES1993 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | Single Chip Satellite Channel Receiver(單片衛(wèi)星頻道接收器) |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 封裝： | MQFP-100 |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 90K |
| 代理商： | VES1993 |
1999 Jan 01
6
Philips Semiconductors
Product specification
Single Chip Satellite Channel Receiver
VES1993
FUNCTIONAL DESCRIPTION
PLL
The VES 1993 implements a PLL used as clock multiplier by 1, 2, 3, 4 or 6, so that the crystal can be low
frequency.
DUAL 6-BIT ADC
The VES 1993 implements a dual 6-bit ADC. The architecture is a standard flash one based on 63 latched
comparators determining simultaneously the precise analog signal level. No external voltage references are
required to use the ADCs.
FILTER BANK
The filter bank contains 2 selectable Anti-Alias lowpath filters (AAF) which, combined with cascadable decimation
filters, allows to perform variable rate demodulation capability over a ratio of up to 45.
COMPLEX MUTIPLIER
Coherent data demodulation (BPSK or QPSK) is performed by complex multiplication of the incoming symbol
with the computed correction angle. This leads to a rotation and a stabilization of the PSK constellation when the
algorithms of carrier and clock recovery have both converged.
The position of this complex multiplier is programmable and can be either after antialiasing filters or before any
filtering.
HALF NYQUIST FILTERS
Half-Nyquist filtering is performed in each arm of the constellation. 2 programmable roll-off are available
depending on the selected standard. The digital filter has 19 (roll-off 0.35) or 25 (roll-off 0.2) taps to provide an
outband attenuation of 40dB.
CARRIER SYNCHRONIZER
The carrier synchronizer block implements successively a phase/frequency comparator, a programmable digital
second order loop filter, a phase accumulator (NCO) that accumulates the phase error and drives a sine/cosine
table to determine the angle for correction, applied to the complex multiplier.
CLOCK SYNCHRONIZER
The clock phase detector block implements the algorithm for variable rate digital timing recovery. The digital
second order loop filter is programmable, and provides an 8-bit command to the NCO block for clock recovery.
AGC
This block calculates the magnitude of the I and Q channels after Nyquist filtering. This value is then compared to
a programmable threshold value, filtered and PWM encoded before being output on the VAGC pin.
VITERBI DECODER
The Viterbi decoder performs a maximum likelihood estimation over the received data on the basis of four-bit
quantized samples of the demodulated signals. The average truncation length is 144. The rate R can be chosen
between R = 1/2 and R = 8/9 (punctured codes). Automatic viterbi rate recovery can be selected, so as
automatic spectral inversion ambiguity resolution. The rate search is performed among rates , 2/3, , 5/6 and
7/8 In DVB-S standard and among rates 2/3 and 6/7 in DSS mode. Output Bit Error Rate (VBER) is provided by
the decoder. Differential decoding is selectable. The Viterbi decoder provides decoded data and the
corresponding clock.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| VES9600 | Single Chip DVB-T Channel Receiver(單片DVB-T頻道接收器) |
| VESTIGIALSAWS | Vestigial Sideband Filters for Professional Applications |
| VF150CSM | Peripheral IC |
| VF150T | Peripheral IC |
| VF150T1 | Peripheral IC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| VES-220M0JTR-0405 | 功能描述:鋁質(zhì)電解電容器-SMD 6.3 Volts 22uF 20% 4x5.3 RoHS:否 制造商:Vishay/BC Components 電容:2200 uF 容差:20 % 電壓額定值:16 V ESR: 工作溫度范圍:- 55 C to + 150 C 尺寸:16 mm W x 16 mm L x 21 mm H 產(chǎn)品:High Temp Electrolytic Capacitors |
| VES-220M1ATR-0505 | 功能描述:鋁質(zhì)電解電容器-SMD 10 Volts 22uF 20% 5x5.3 RoHS:否 制造商:Vishay/BC Components 電容:2200 uF 容差:20 % 電壓額定值:16 V ESR: 工作溫度范圍:- 55 C to + 150 C 尺寸:16 mm W x 16 mm L x 21 mm H 產(chǎn)品:High Temp Electrolytic Capacitors |
| VES-220M1CTR-0505 | 功能描述:鋁質(zhì)電解電容器-SMD 16 Volts 22uF 20% 5x5.3 RoHS:否 制造商:Vishay/BC Components 電容:2200 uF 容差:20 % 電壓額定值:16 V ESR: 工作溫度范圍:- 55 C to + 150 C 尺寸:16 mm W x 16 mm L x 21 mm H 產(chǎn)品:High Temp Electrolytic Capacitors |
| VES-220M1ETR-0605 | 功能描述:鋁質(zhì)電解電容器-SMD 25 Volts 22uF 20% 6.3x5.3 RoHS:否 制造商:Vishay/BC Components 電容:2200 uF 容差:20 % 電壓額定值:16 V ESR: 工作溫度范圍:- 55 C to + 150 C 尺寸:16 mm W x 16 mm L x 21 mm H 產(chǎn)品:High Temp Electrolytic Capacitors |
| VES-220M1HTR-0605 | 功能描述:鋁質(zhì)電解電容器-SMD 50 Volts 22uF 20% 6.3x5.3 RoHS:否 制造商:Vishay/BC Components 電容:2200 uF 容差:20 % 電壓額定值:16 V ESR: 工作溫度范圍:- 55 C to + 150 C 尺寸:16 mm W x 16 mm L x 21 mm H 產(chǎn)品:High Temp Electrolytic Capacitors |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。