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參數資料
| 型號： | THS5641IDW |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | DAC |
| 英文描述： | PARALLEL, 8 BITS INPUT LOADING, 0.035 us SETTLING TIME, 8-BIT DAC, PDSO28 |
| 封裝： | PLASTIC, SOIC-28 |
| 文件頁數： | 8/29頁 |
| 文件大小： | 725K |
| 代理商： | THS5641IDW |
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THS5641
8-BIT, 100 MSPS, CommsDAC
DIGITAL-TO-ANALOG CONVERTER
SLAS199A – MAY 1999 REVISED JUNE 1999
16
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
reference operation
The THS5641 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 RBIAS. The bias current IBIAS through resistor
RBIAS 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 IOUTFS can thus be expressed as:
IOUT
FS + 32
I
BIAS +
32
V
EXTIO
R
BIAS
where VEXTIO 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
CEXT of 0.1 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 AVDD. Capacitor CEXT 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 RBIAS 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 25. 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
+
–
+
–
AVDD
AGND
EXTLO
EXTIO
BIASJ
AVDD
IOUT1 or IOUT2
External
Control AMP
EXT Reference
Voltage
COMP1
SLEEP
Current Source Array
REXT
Internal
Control AMP
THS4041
Figure 25. Bypassing the Internal Reference and Control Amplifier
相關PDF資料 |
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| THS5641IPW | PARALLEL, 8 BITS INPUT LOADING, 0.035 us SETTLING TIME, 8-BIT DAC, PDSO28 |
| THS5641IPWR | PARALLEL, 8 BITS INPUT LOADING, 0.035 us SETTLING TIME, 8-BIT DAC, PDSO28 |
| THS5651AIDW | PARALLEL, WORD INPUT LOADING, 0.035 us SETTLING TIME, 10-BIT DAC, PDSO28 |
| THS5651AIPWR | PARALLEL, WORD INPUT LOADING, 0.035 us SETTLING TIME, 10-BIT DAC, PDSO28 |
| THS5651AIPWRG4 | PARALLEL, WORD INPUT LOADING, 0.035 us SETTLING TIME, 10-BIT DAC, PDSO28 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| THS5641IPW | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| THS5641PW | 制造商:TI 制造商全稱:Texas Instruments 功能描述:8-BIT, 100 MSPS, CommsDACE DIGITAL-TO-ANALOG CONVERTER |
| THS5651 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-BIT, 100 MSPS, CommsDACE DIGITAL-TO-ANALOG CONVERTER |
| THS5651A | 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-BIT, 125 MSPS, CommsDACE DIGITAL-TO-ANALOG CONVERTER |
| THS5651ADW | 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-BIT, 125 MSPS, CommsDACE DIGITAL-TO-ANALOG CONVERTER |
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