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參數(shù)資料
| 型號： | THS5661APW |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 12-BIT, 125 MSPS, CommsDACE DIGITAL-TO-ANALOG CONVERTER |
| 中文描述： | 12位，125 MSPS的，CommsDACE數(shù)字模擬轉(zhuǎn)換器 |
| 文件頁數(shù)： | 19/31頁 |
| 文件大?。?/td> | 814K |
| 代理商： | THS5661APW |
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THS5661A
12-BIT, 125 MSPS, CommsDAC
DIGITAL-TO-ANALOG CONVERTER
SLAS247 – NOVEMBER 1999
19
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
reference operation
The THS5661A comprises a bandgap reference and control amplifier for biasing the full-scale output current.
The full-scale output current is set by applying an external resistor R
BIAS
. The bias current I
BIAS
through resistor
R
BIAS
is defined by the on-chip bandgap reference voltage and control amplifier. The full-scale output current
equals 32 times this bias current. The full-scale output current IOUT
FS
can thus be expressed as:
32
V
EXTIO
R
BIAS
IOUT
FS
32
I
BIAS
where V
EXTIO
is the voltage at terminal EXTIO. The bandgap reference voltage delivers an accurate voltage
of 1.2 V. This reference is active when terminal EXTLO is connected to AGND. An external decoupling capacitor
C
EXT
of 0.1
μ
F should be connected externally to terminal EXTIO for compensation. The bandgap reference
can additionally be used for external reference operation. In that case, an external buffer with high impedance
input should be applied in order to limit the bandgap load current to a maximum of 100 nA. The internal reference
can be disabled and overridden by an external reference by connecting EXTLO to AV
DD
. Capacitor C
EXT
may
hence be omitted. Terminal EXTIO thus serves as either input or output node.
The full-scale output current can be adjusted from 20 mA down to 2 mA by varying resistor R
BIAS
or changing
the externally applied reference voltage. The internal control amplifier has a wide input range, supporting the
full-scale output current range of 20 dB. The bandwidth of the internal control amplifier is defined by the internal
1 nF compensation capacitor at pin COMP1 and the external compensation capacitor C1. The relatively weak
internal control amplifier may be overridden by an externally applied amplifier with sufficient drive for the internal
1 nF load, as shown in Figure 31. This provides the user with more flexibility and higher bandwidths, which are
specifically attractive for gain control and multiplying DAC applications. Pin SLEEP should be connected to
AGND or left disconnected when an external control amplifier is used.
AVDD
1.2 V
REF
REF AMP
+
1 nF
–
+
–
THS4041
AVDD
AGND
EXTLO
EXTIO
BIASJ
AVDD
IOUT1 or IOUT2
External
Control AMP
EXT Reference
Voltage
COMP1
SLEEP
Current Source Array
REXT
Internal
Control AMP
Figure 31. Bypassing the Internal Reference and Control Amplifier
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相關(guān)代理商/技術(shù)參數(shù) |
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| THS5661DW | 制造商:TI 制造商全稱:Texas Instruments 功能描述:12-BIT, 100 MSPS, CommsDACE DIGITAL-TO-ANALOG CONVERTER |
| THS5661EVM | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 THS5661 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
| THS5661IDW | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| THS5661IPW | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| THS5661PW | 制造商:TI 制造商全稱:Texas Instruments 功能描述:12-BIT, 100 MSPS, CommsDACE DIGITAL-TO-ANALOG CONVERTER |
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