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參數資料
| 型號： | LTC1668C |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Replaced by TLV5617A : 10-Bit Dual DAC 8-SOIC |
| 中文描述： | 16位，50 MSPS的數模轉換器 |
| 文件頁數： | 10/16頁 |
| 文件大?。?/td> | 728K |
| 代理商： | LTC1668C |
10
LTC1668
APPLICATIOU
cause phase modulation of the clock signal and the DAC
waveform, and can produce spurious tones. It is normally
best to place the digital data transitions near the falling
clock edge, well away from the active rising clock edge.
Because the clock signal contains spectral components
only at the sampling frequency and its multiples, it is
usually not a source of in band spurious tones. Overall, it
is better to treat the clock as you would an analog signal
and route it separately from the digital data input signals.
The clock trace should be routed either over the analog
ground plane or over its own section of the ground plane.
The clock line needs to have accurately controlled imped-
ance and should be well terminated near the LTC1668.
W
U
U
Printed Circuit Board Layout Considerations—
Grounding, Bypassing and Output Signal Routing
The close proximity of high frequency digital data lines and
high dynamic range, wide-band analog signals makes
clean printed circuit board design and layout an absolute
necessity. Figures 5 to 9 are the printed circuit board layers
for an AC evaluation circuit for the LTC1668. Ground
planes should be split between digital and analog sections
as shown. All bypass capacitors should have minimum
trace length and be ceramic 0.1
μ
F or larger with low ESR.
Bypass capacitors are required on V
SS
, V
DD
and REFOUT,
and all connected to the AGND plane. The COMP2 pin ties
to a node in the output current switching circuitry, and it
requires a 0.1
μ
F bypass capacitor. It should be bypassed
to V
SS
along with COMP1. The AGND and DGND pins
should both tie directly to the AGND plane, and the tie point
between the AGND and DGND planes should nominally be
near the DGND pin. LADCOM should either be tied directly
to the AGND plane or be bypassed to AGND. The I
OUT A
and
I
OUT B
traces should be close together, short, and well
matched for good AC CMRR. The transformer output
ground should be capable of optionally being isolated or
being tied to the AGND plane, depending on which gives
better performance in the system.
Suggested Evaluation Circuit
Figure 4 is the schematic and Figures 5 to 9 are the circuit
board layouts for a suggested evaluation circuit, DC245A.
The circuit can be programmed with component selection
and jumpers for a variety of differentially coupled trans-
former output and differential and single-ended resistor
loaded output configurations.
相關PDF資料 |
PDF描述 |
|---|---|
| LTC1668IG | CONNECTOR ACCESSORY |
| LTC1668CG | Replaced by TLV5617A : 10-Bit Dual DAC 8-SOIC |
| LTC1668I | Replaced by TLV5617A : 10-Bit Dual DAC 8-SOIC |
| LTC1669 | Replaced by TLV5617A : 10-Bit, 2.5 us Dual DAC, Serial Input, Pgrmable Settling Time, Simultaneous Update, Low Power 8-SOIC 0 to 70 |
| LTC1669-1CS5 | 10-Bit Rail-to-Rail Micropower DAC with I2C Interface |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LTC1668CG | 功能描述:IC D/A CONV 16BIT 50MSPS 28-SSOP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 數模轉換器 系列:- 產品培訓模塊:Data Converter Fundamentals DAC Architectures 標準包裝:750 系列:- 設置時間:7µs 位數:16 數據接口:并聯 轉換器數目:1 電壓電源:雙 ± 功率耗散（最大）:100mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-LCC（J 形引線） 供應商設備封裝:28-PLCC（11.51x11.51） 包裝:帶卷 (TR) 輸出數目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k |
| LTC1668CG#PBF | 功能描述:IC DAC 16BIT 50MSPS 28-SSOP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 數模轉換器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 設置時間:4µs 位數:12 數據接口:串行 轉換器數目:2 電壓電源:單電源 功率耗散（最大）:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:8-uMAX 包裝:管件 輸出數目和類型:2 電壓，單極 采樣率（每秒）:* 產品目錄頁面:1398 (CN2011-ZH PDF) |
| LTC1668CG#TR | 功能描述:IC DAC 16BIT 50MSPS 28SSOP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 數模轉換器 系列:- 產品培訓模塊:Data Converter Fundamentals DAC Architectures 標準包裝:750 系列:- 設置時間:7µs 位數:16 數據接口:并聯 轉換器數目:1 電壓電源:雙 ± 功率耗散（最大）:100mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-LCC（J 形引線） 供應商設備封裝:28-PLCC（11.51x11.51） 包裝:帶卷 (TR) 輸出數目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k |
| LTC1668CG#TRPBF | 功能描述:IC D/A CONV 16BIT 50MSPS 28-SSOP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 數模轉換器 系列:- 產品培訓模塊:Data Converter Fundamentals DAC Architectures 標準包裝:750 系列:- 設置時間:7µs 位數:16 數據接口:并聯 轉換器數目:1 電壓電源:雙 ± 功率耗散（最大）:100mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-LCC（J 形引線） 供應商設備封裝:28-PLCC（11.51x11.51） 包裝:帶卷 (TR) 輸出數目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k |
| LTC1668CGPBF | 制造商:Linear Technology 功能描述:DAC 16-Bit 50Msps Spectral Purity SSOP28 |
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