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參數(shù)資料
| 型號： | MAX1192ETI+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 17/27頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 8BIT 22MSPS DL 28-TQFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 位數(shù)： | 8 |
| 采樣率（每秒）： | 22M |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 2 |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 28-TQFN-EP（5x5） |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 4 個單端，雙極；2 個差分，雙極 |
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MAX1192
Ultra-Low-Power, 22Msps, Dual 8-Bit ADC
24
______________________________________________________________________________________
Typical QAM Demodulation Application
Quadrature amplitude modulation (QAM) is frequently
used in digital communications. Typically found in
spread-spectrum-based systems, a QAM signal repre-
sents a carrier frequency modulated in both amplitude
and phase. At the transmitter, modulating the baseband
signal with quadrature outputs, a local oscillator fol-
lowed by subsequent upconversion can generate the
QAM signal. The result is an in-phase (I) and a quadra-
ture (Q) carrier component, where the Q component is
90
° phase shifted with respect to the in-phase compo-
nent. At the receiver, the QAM signal is demodulated
into analog I and Q components. Figure 12 displays the
demodulation process performed in the analog domain
using the MAX1192 dual-matched, 3V, 8-bit ADC and
the MAX2451 quadrature demodulator to recover and
digitize the I and Q baseband signals. Before being dig-
itized by the MAX1192, the mixed-down signal compo-
nents can be filtered by matched analog filters, such as
Nyquist or pulse-shaping filters. The filters remove
unwanted images from the mixing process, thereby
enhancing the overall signal-to-noise (SNR) perfor-
mance and minimizing intersymbol interference.
Grounding, Bypassing,
and Board Layout
The MAX1192 requires high-speed board layout design
techniques. Refer to the MAX1193 Evaluation Kit data
sheet for a board layout reference. Locate all bypass
capacitors as close to the device as possible, prefer-
ably on the same side as the ADC, using surface-
mount devices for minimum inductance. Bypass VDD to
GND with a 0.1F ceramic capacitor in parallel with a
2.2F bipolar capacitor. Bypass OVDD to OGND with a
0.1F ceramic capacitor in parallel with a 2.2F bipolar
capacitor. Bypass REFP, REFN, and COM each to
GND with a 0.33F ceramic capacitor.
Multilayer boards with separated ground and power
planes produce the highest level of signal integrity. Use
a split ground plane arranged to match the physical
location of the analog ground (GND) and the digital
output driver ground (OGND) on the ADC’s package.
Connect the MAX1192 exposed backside paddle to
GND. Join the two ground planes at a single point such
that the noisy digital ground currents do not interfere
with the analog ground plane. The ideal location of this
connection can be determined experimentally at a
point along the gap between the two ground planes,
which produces optimum results. Make this connection
with a low-value, surface-mount resistor (1
Ω to 5Ω), a
ferrite bead, or a direct short. Alternatively, all ground
pins could share the same ground plane, if the ground
plane is sufficiently isolated from any noisy, digital sys-
tems ground plane (e.g., downstream output buffer or
DSP ground plane).
Route high-speed digital signal traces away from the
sensitive analog traces of either channel. Make sure to
isolate the analog input lines to each respective con-
verter to minimize channel-to-channel crosstalk. Keep
all signal lines short and free of 90
° turns.
0
°
90
°
÷8
DOWNCONVERTER
MAX2451
INA+
MAX1192
INA-
INB+
INB-
DSP
POST-
PROCESSING
A/B
Figure 12. Typical QAM Receiver Application
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1193ETI | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1193ETI+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8-Bit 2Ch 45Msps 3.6V Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1193ETI+D | 制造商:Maxim Integrated Products 功能描述:ADC DUAL PIPELINED 45MSPS 8BIT PARALLEL 28TQFN - Rail/Tube |
| MAX1193ETI+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8-Bit 2Ch 45Msps 3.6V Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1193ETI+TD | 制造商:Maxim Integrated Products 功能描述:ADC DUAL PIPELINED 45MSPS 8BIT PARALLEL 28TQFN - Tape and Reel |
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