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參數(shù)資料
| 型號： | THS5671APW |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 14-BIT, 125 MSPS, CommsDAC DIGITAL-TO-ANALOG CONVERTER |
| 中文描述： | 14位，125 MSPS的，CommsDAC數(shù)字模擬轉(zhuǎn)換器 |
| 文件頁數(shù)： | 15/31頁 |
| 文件大?。?/td> | 825K |
| 代理商： | THS5671APW |
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THS5671A
14-BIT 125 MSPS, CommsDAC
DIGITAL-TO-ANALOG CONVERTER
SLAS201A
–
DECEMBER 1999
–
REVISED SEPTEMBER 2002
15
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
The THS5671A architecture is based on current steering, combining high update rates with low power
consumption. The CMOS device consists of a segmented array of PMOS transistor current sources, which are
capable of delivering a full-scale current up to 20 mA. High-speed differential current switches direct the current
of each current source to either one of the output nodes, IOUT1 or IOUT2. The complementary output currents
thus enable differential operation, canceling out common mode noise sources (on-chip and PCB noise), dc
offsets, even order distortion components, and increases signal output power by a factor of two. Major
advantages of the segmented architecture are minimum glitch energy, excellent DNL, and very good dynamic
performance. The DAC
’
s high output impedance of >300 k
and fast switching result in excellent dynamic
linearity (spurious free dynamic range SFDR).
The full-scale output current is set using an external resistor R
BIAS
in combination with an on-chip bandgap
voltage reference source (1.2 V) and control amplifier. The current I
BIAS
through resistor R
BIAS
is mirrored
internally to provide a full-scale output current equal to 32 times I
BIAS
. The full-scale current can be adjusted
from 20 mA down to 2 mA.
data interface and timing
The THS5671A comprises separate analog and digital supplies, i.e. AV
DD
and DV
DD
. The digital supply voltage
can be set from 5.5 V down to 3 V, thus enabling flexible interfacing with external logic. The THS5671A provides
two operating modes, as shown in Table 1. Mode 0 (mode pin connected to DGND) supports a straight binary
input data word format, whereas mode 1 (mode pin connected to DV
DD
) sets a twos complement input
configuration.
Figure 29 shows the timing diagram. Internal edge-triggered flip-flops latch the input word on the rising edge
of the input clock. The THS5671A provides for minimum setup and hold times (> 1 ns), allowing for noncritical
external interface timing. Conversion latency is one clock cycle for both modes. The clock duty cycle can be
chosen arbitrarily under the timing constraints listed in the digital specifications table. However, a 50% duty cycle
will give optimum dynamic performance. Figure 30 shows a schematic of the equivalent digital inputs of the
THS5671A, valid for pins D13
–
D0, SLEEP, and CLK. The digital inputs are CMOS-compatible with logic
thresholds of DV
DD
/2
±
20%. Since the THS5671A is capable of being updated up to 125 MSPS, the quality of
the clock and data input signals are important in achieving the optimum performance. The drivers of the digital
data interface circuitry should be specified to meet the minimum setup and hold times of the THS5671A, as well
as its required min/max input logic level thresholds. Typically, the selection of the slowest logic family that
satisfies the above conditions will result in the lowest data feed-through and noise. Additionally, operating the
THS5671A with reduced logic swings and a corresponding digital supply (DV
DD
) will reduce data feed-through.
Note that the update rate is limited to 70 MSPS for a digital supply voltage DV
DD
of 3 V to 3.6 V.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| THS5671EVM | 功能描述:放大器 IC 開發(fā)工具 THS5671 Eval Mod RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
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| THS6002 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:DUAL DIFFERENTIAL LINE DRIVERS AND RECEIVERS |
| THS6002C | 制造商:TI 功能描述:IC, SMT |
| THS6002CDWP | 功能描述:緩沖器和線路驅(qū)動器 Dual Diff/Receiver Line Driver RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
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