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參數(shù)資料
| 型號(hào)： | TC850ILW |
| 廠商： | TelCom Semiconductor, Inc. |
| 英文描述： | 15-BIT, FAST-INTEGRATING CMOS ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 15位，快速整合過(guò)程CMOS模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 8/14頁(yè) |
| 文件大小： | 164K |
| 代理商： | TC850ILW |
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3-84
TELCOM SEMICONDUCTOR, INC.
15-BIT, FAST-INTEGRATING CMOS
ANALOG-TO-DIGITAL CONVERTER
TC850
Figure 5. Bus Interface Simplified Schematic
Differential Reference (V
REF
)
The TC850 requires two reference voltage sources in
order to generate the "fast-slow" deintegrate phases. The
main voltage reference (V
REF1
) is applied between the REF
1
and REF
–
pins. The secondary reference (V
REF2
) is applied
between the REF
2
The reference voltage inputs are fully differential, and
the reference voltage can be generated anywhere within the
power supply voltage of the converter. However, to minimize
roll-over error, especially at high conversion rates, keep the
reference common-mode voltage (i.e., REF
–
) near or at the
analog common potential. All voltage reference inputs are
high impedance. Average reference input current is typically
only 30pA.
+
+
and REF
–
pins.
Analog Common (COMMON)
Analog common is used as the IN
–
return during the
zero-integrator and deintegrate phases of each conversion.
If IN
–
is at a different potential than analog common, a
common-mode voltage exists in the system. This signal is
rejected by the 86 dB CMRR of the converter. However, in
most applications, IN
–
will be set at a fixed, known voltage
(power supply common, for instance). In this case, analog
common should be tied to the same point so that the
common-mode voltage is eliminated.
RD
L/H
3-STATE
BUFFER
OUTPUT
ENABLE
END OF
CONVERSION
CONT/
DEMAND
START
CONVERSION
TO A/D
CONTROL
LOGIC
OCTAL
2-INPUT
MUX
SELECT
LOW-BYTE
UP/DOWN
COUNTER
HIGH-BYTE
UP/DOWN
COUNTER
POLARITY
OVERANGE
TC850
8
SELECT
2-INPUT
MUX
DBO–DB7
8
7
8
CE
CS
WR
POL/OVR
DIGITAL SECTION DESCRIPTION
The TC850 digital section consists of two sets of conver-
sion counters, control and sequencing logic, clock oscillator
and divider, data latches, and an 8-bit, 3-state interface bus.
A simplified schematic of the bus interface logic is shown in
Figure 5.
Clock Oscillator
The TC850 includes a crystal oscillator on-chip. All that
is required is to connect a crystal across OSC
1
and OSC
2
pins, and to add two inexpensive capacitors (Figure 1). The
oscillator output is
÷
4 prior to clocking the A/D internal
counters. For example, a 100kHz crystal produces a system
clock frequency of 25kHz. Since each conversion requires
1280 clock periods, in this case the conversion rate will be
25,000/1280, or 19.5 conversions per second.
In most applications, however, an external clock is
divided down from the microprocessor clock. In this case,
the OSC
1
pin is used as the external oscillator input and
OSC
2
is left unconnected. The external clock driver should
swing from digital ground to V
DD
. The
÷
4 function is active for
both external clock and crystal oscillator operations.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC850ILW713 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16 Bit Hi Speed A/D RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| TC8521AM | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:REAL TIME CLOCK ケ |
| TC8521AP | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:REAL TIME CLOCK ケ |
| TC8566AF | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:FLOPPY DISK CONTROLLER |
| TC8569AF | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:FLOPPY DISK CONTROLLER |
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