- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄376444 > x60250 (Intersil Corporation) Micro Power Programmable Voltage Reference(微功耗可編程電壓基準(zhǔn)) PDF資料下載
參數(shù)資料
| 型號： | x60250 |
| 廠商： | Intersil Corporation |
| 英文描述： | Micro Power Programmable Voltage Reference(微功耗可編程電壓基準(zhǔn)) |
| 中文描述： | 微功率可編程電壓參考（微功耗可編程電壓基準(zhǔn)） |
| 文件頁數(shù)： | 7/16頁 |
| 文件大小： | 382K |
| 代理商： | X60250 |
7
FN8146.1
September 14, 2005
FUNCTIONAL DESCRIPTION
The X60250 combines a micropower precision reference
with an 8-bit, 256 tap digitally controlled 100k
potentiometer (DCP) which allows nonvolatile setting of
an output reference voltage. When normally configured
with the V
REFL
pin tied to ground, the device provides an
output range of 0V to 1.25V with 4.90mV resolution.
The device can also be configured with an optional
100k
series resistor to ground, which effectively halves
the output voltage range while doubling the resolution.
Grounding the R
1
pin while floating the V
REFL
pin places
the device in this mode. Output voltage setting accuracy
can be as high as 0.10% while permitting adjustment
from 0.625V to 1.25V (2.45mV resolution).
Reference Section
The reference is designed to provide an accurate, low
tempco voltage source while requiring less than 12μA
(typical) of supply current. This supply current is for the
reference section only. Keep in mind that the DCP will
increase supply current draw by VREF/RTOTAL
(typically 1.25/100k or 12.5μA). The total current drawn
by the adjustable reference circuit will be less than 25μA
(typically).
The reference output has a typical impedance of 1
and
can provide up to 400μA of load current. It is intended to
drive the resistive load of the DCP, which is a minimum
of 85k
, but can also be used to drive off chip circuitry
provided the loading does not exceed the 400μA
maximum. Also, highly capacitive loads can make the
reference oscillate, so no more than 2000pF should be
placed directly on the output of the V
REFOUT
pin.
The reference output produces about 200μV RMS of
noise (10kHz bandwidth) due to its micropower design.
This is easily reduced in normal applications, as shown in
the applications section for optimizing circuits for
reducing output noise levels.
DCP Section
The 256 tap DCP has an 8-bit nonvolatile wiper control
register which controls which tap is selected. The
register is changed by performing a serial data write to its
address (0h, see Serial Interface section). The resulting
wiper position will produce an output voltage at V
OUT
,
depending on whether the DCP V
REFL
is grounded or the
R
1
pin is grounded. The wiper consists of CMOS
transistors and has a finite resistance, typically 600
at
V
CC
= 5V (this parameter increases with decreasing
V
CC
). The wiper resistance will produce errors in
reference circuits due to I-R drops if current flows
through the wiper. However, typically these circuits will
have the wiper connected to a high impedance
comparator or amplifier input which results in very small
wiper currents and thus only a small output voltage error.
If the X60250 is used with the wiper connected to V
REFL
to produce a current source, care must be taken to avoid
exceeding the maximum output current of the reference
(typically 400μA).
Power-Up considerations
The X60250 contains EEPROM nonvolatile storage cells
which are recalled during power-up. This recall process
works best with power supply (V
CC
) ramping that is
monotonic and free of excessive glitches (<100mV
disturbances give best results). The ramp rate spec
should be adhered to, although the most sensitive part of
recall is between V
CC
= 1.0V and 2.5V. Effort should be
made to make sure the device receives a power-up ramp
between those voltage levels that meet the ramp rate
spec and have no glitches.
Recall of the stored wiper position happens in < 1ms
from V
CC
reaching 2.5V. Note that any excursions of V
CC
below 2.5V, although temporary, can cause the wiper to
be loaded with the midpoint value (80h) until V
CC
recovers to its normal voltage.
Register Organization
There are 2 nonvolatile registers and 1 volatile register
available for storage and recall via the serial bus. They
contain the current wiper position, a general purpose
data register and a status register.
The wiper register is nonvolatile and is at address 0h and
contains 8 bits, with the 00h setting corresponding to the
tap position nearest V
REFL
, and the FFh setting nearest
to V
REFOUT
.
The general purpose register is nonvolatile and is at
address 1h, and contains 8 bits for use as scratchpad
memory or serial number information.
The Status register is volatile and is at address 7h. It has
one active bit, D3, which is the WEL bit. This bit must be
set to 1 berfore any nonvolatile writes are performed to
the other registers. See the register information on the
next page.
X60250
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| X60250V8I | Micro Power Programmable Voltage Reference |
| X60250V8IZ | Micro Power Programmable Voltage Reference |
| X79002 | NV DAC with Selectable Output Range and Memory |
| X79000 | NV DAC with Selectable Output Range and Memory |
| X79000V20I | NV DAC with Selectable Output Range and Memory |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| X60250V8I | 功能描述:IC VREF SERIES ADJ 8-TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電壓基準(zhǔn) 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 基準(zhǔn)類型:旁路，精度 輸出電壓:5V 容差:±0.5% 溫度系數(shù):100ppm/°C 輸入電壓:- 通道數(shù):1 電流 - 陰極:80µA 電流 - 靜態(tài):- 電流 - 輸出:15mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:TO-236-3，SC-59，SOT-23-3 供應(yīng)商設(shè)備封裝:SOT-23-3 包裝:帶卷 (TR) 其它名稱:LM4040CIM3-5.0MLTRLM4040CIM3-5.0MLTR-ND |
| X60250V8IZ | 功能描述:IC VREF SERIES ADJ 8-TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電壓基準(zhǔn) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 基準(zhǔn)類型:串聯(lián)，精度 輸出電壓:4.5V 容差:±800µV 溫度系數(shù):1ppm/°C 輸入電壓:13.5 V ~ 22 V 通道數(shù):1 電流 - 陰極:- 電流 - 靜態(tài):7mA 電流 - 輸出:10mA 工作溫度:-55°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:20-LCC 供應(yīng)商設(shè)備封裝:20-CLCC 包裝:管件 |
| X60M000000L006 | 制造商:AEL Crystals Limited 功能描述:CRYSTAL 60MHZ HC49/U |
| X60R75 | 制造商:Teledyne Relays 功能描述:RELAY SSR 30MA 30V DC-IN 75A 690V AC-OUT 4-PIN - Bulk 制造商:Teledyne Industrial 功能描述: 制造商:Teledyne Relays 功能描述:SOLID STATE RELAY |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。