參數(shù)資料
型號: 5962-0724701VXA
廠商: TEXAS INSTRUMENTS INC
元件分類: DAC
英文描述: PARALLEL, WORD INPUT LOADING, 0.0035 us SETTLING TIME, 14-BIT DAC, CBGA192
封裝: CERAMIC, BGA-192
文件頁數(shù): 17/30頁
文件大小: 970K
代理商: 5962-0724701VXA
Bandgap
Reference
REFIO_IN
REFIO
RBIASOUT
RBIASIN
1.2VReference
External
REFIO
Filter
Capacitor
External
REFIO
Filter
Capacitor
External
RBIAS
Resistor
External
RBIAS
Resistor
+
-
SGLS386A – JANUARY 2009 – REVISED DECEMBER 2009
www.ti.com
Reference Operation
Figure 22. Reference Circuit
The DAC5670 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 to pins RBIASOUT and RBIASIN. 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:
IOUTFS = 32 × IBIAS = 32 × VREFIO/RBIAS
(9)
Where:
VREFIO Voltage at terminals REFIO and REFIO_IN
The bandgap reference voltage delivers an accurate voltage of 1.2 V. An external REFIO filter capacitor of 0.1
μF should be connected externally to the terminals REFIO and REFIO_IN for compensation.
The full-scale output current can be adjusted from 30 mA down to 5 mA by varying external resistor RBIAS .
24
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): DAC5670-SP
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