参数资料
型号: TMS320C2812ZHHS
厂商: TEXAS INSTRUMENTS INC
元件分类: 数字信号处理
英文描述: 16-BIT, 150 MHz, OTHER DSP, PBGA179
封装: LEAD FREE, BGA-179
文件页数: 122/156页
文件大小: 1826K
代理商: TMS320C2812ZHHS
Peripherals
68
April 2001 Revised October 2005
SPRS174M
ADCINA[7:0]
ADCINB[7:0]
ADCLO
ADCBGREFIN
ADC External Current Bias Resistor
ADCRESEXT
ADCREFP
VDDA1
VDDA2
VSSA1
VSSA2
AVDDREFBG
AVSSREFBG
VDDAIO
VSSAIO
VDD1
VSS1
Test Pin
ADC Reference Positive Input
ADCREFM
ADC Reference Medium Input
ADC Analog Power
ADC Reference Power
ADC Analog I/O Power
ADC Digital Power
Analog Input 03 V With Respect to ADCLO
Connect to Analog Ground
24.9 k
W/20 kW (C)
Analog 3.3 V
Analog Ground
1.8 V Can use the same 1.8-V (or 1.9-V)
supply as the digital core but separate the
two with a ferrite bead or a filter
Digital Ground
ADC 16-Channel Analog Inputs
1
mF 10 mF
2 V
1 V
1
mF 10 mF
NOTES: A. External decoupling capacitors are recommended on all power pins.
B. Analog inputs must be driven from an operational amplifier that does not degrade the ADC performance.
C. Use 24.9 k
for ADC clock range 1 18.75 MHz; use 20 k for ADC clock range 18.75 25 MHz.
D. It is recommended that buffered external references be provided with a voltage difference of (ADCREFP-ADCREFM)
= 1 V
$ 0.1% or better.
External reference is enabled using bit 8 in the ADCTRL3 Register at ADC power up. In this mode, the accuracy of
external reference is critical for overall gain. The voltage ADCREFPADCREFM will determine the overall accuracy.
Do not enable internal references when external references are connected to ADCREFP and ADCREFM. See the
TMS320x281x DSP Analog-to-Digital Converter (ADC) Reference Guide (literature number SPRU060) for more
information.
(D)
Figure 46. ADC Pin Connections With External Reference
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