參數(shù)資料
型號(hào)： THS5641PW
廠商： Texas Instruments, Inc.
英文描述： 8-BIT, 100 MSPS, CommsDACE DIGITAL-TO-ANALOG CONVERTER
中文描述： 8位，100 MSPS的，CommsDACE數(shù)字模擬轉(zhuǎn)換器
文件頁(yè)數(shù)： 16/28頁(yè)
文件大小： 702K
代理商： THS5641PW
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 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 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
–
+
–
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 25. Bypassing the Internal Reference and Control Amplifier
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