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參數(shù)資料
| 型號： | LX1670CD-TR |
| 廠商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, PDSO14 |
| 封裝： | LEAD FREE, PLASTIC, SOIC-14 |
| 文件頁數(shù)： | 6/7頁 |
| 文件大?。?/td> | 222K |
| 代理商： | LX1670CD-TR |
5-B IT P ROGRAMMABLE V O L TAGE R EFERENCE
LX1670
PRODUCT DA T ABOOK 1996/1997
Copyright 1997
Rev. 1.0a
6
P RODUCTION D ATA S HEET
THEOR Y OF OPERA TION
UNDER-VOLTAGE LOCKOUT
This function keeps order to the IC until the power supply voltage
reaches 85% of its nominal value. The output voltage is pulled low
and P
GOOD and OVOUT are pulled low.
Once the power supply
voltage crosses 85%, the output voltage, VIDO, is released, and
P
GOOD
continues to be pulled low.
When V
SENSE
(the
microprocessor's power supply) is within ±7% of VIDO, P
GOOD is
released.
The comparator has hysteresis to prevent transient
oscillation.
4-BIT DAC and 5th-BIT SCALER
This function generates a precise voltage from a binary, 5-bit
digital word VID [0:4]. It uses a 4-bit, binary weighted current
DAC, driving a precise current to voltage converter. This voltage
is then op-amp buffered and sent out. The scaling is accomplished
by multiplexing the buffer op-amp. The resulting transfer function
is:
VIDO (D0,D1,D2,D3) =
(2.00 + 0.1 * (1*D0 + 2*D1 + 4*D2 + 8*D3))
for D4 = 1
VIDO (D0,D1,D2,D3) =
(2.00 + 0.6 + 0.1 * (1*D0 + 2*D1 + 4*D2 + 8*D3)) * 0.5
for D4 = 0
for the code VIDO < 1.8V will be blocked and VIDO = 0.
The zero-scale output voltage, full-scale output voltage and the
scale factor are all trimmed on-chip using fusable links.
OVER- / UNDER-VOLTAGE COMPARATORS
This function generates an open collector Power Good signal
when V
SENSE is within ±7% of VIDO.
OVER-VOLTAGE PROTECTION
This function generates an OV
OUT voltage signal when VSENSE is 15%
higher than VIDO. This voltage can be used to drive an external
SCR.
CHIP ENABLE
This function disables the chip when low. VIDO, P
GOOD and OVOUT
are all pulled low. When ENABLE is high, the chip's state is then
determined by the other functions.
BLANK ENABLE
This function will disable VIDO for codes with voltages below
1.80V when this pin is high. When pulled low, this function will
allow VIDO to accept codes for voltages of 1.30 to 3.50V.
O
B
SO
LETE
PRO
D
UCT
NOT
RECOMMENDED
FOR
NEW
DESIGNS
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