ISL21009CFB825Z-TK Intersil, ISL21009CFB825Z-TK Datasheet - Page 17

• Manufacturer Part Number: ISL21009CFB825Z-TK
• Description: IC VOLT REF FGA LV 2.5V 8-SOIC
• Manufacturer: Intersil
• Series: FGA™r

Specifications of ISL21009CFB825Z-TK

• Reference Type: Series
• Voltage - Output: 2.5V
• Tolerance: ±1mV
• Temperature Coefficient: 5ppm/°C
• Voltage - Input: 3.5 ~ 16.5 V
• Number Of Channels: 1
• Current - Quiescent: 180µA
• Current - Output: 7mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Cathode: -
• Other names: ISL21009CFB825Z-TKTR

Temperature Coefficient
The limits stated for temperature coefficient (tempco) are
governed by the method of measurement. The overwhelming
standard for specifying the temperature drift of a reference is to
measure the reference voltage at two temperatures, take the
total variation, (V
extremes of measurement (T
divided by the nominal reference voltage (at T = +25°C) and
multiplied by 10
specifying temperature coefficient.
Typical Application Circuits
6
HIGH
to yield ppm/°C. This is the “Box” method for
FIGURE 60. 2.5V FULL SCALE LOW-DRIFT, LOW NOISE, 10-BIT ADJUSTABLE VOLTAGE SOURCE
– V
LOW
+3.5V TO 16.5V
HIGH
), and divide by the temperature
17
2-WIRE BUS
– T
LOW
V
). The result is
IN
FIGURE 59. PRECISION 2.5V, 50mA REFERENCE
= +5.0V
ISL21009-25
V
OUT
GND
V
= 2.50V
IN
ISL21009
V
SDA
SCL
OUT
V
V
CC
GND
V
X9119
SS
V
OUT
= 2.50V
IN
R
R = 200Ω
V
R
H
ISL21009
OUT
L
0.1µF
Output Voltage Adjustment
The output voltage can be adjusted up or down by 2.5% by
placing a potentiometer from V
wiper to the TRIM pin. The TRIM input is high impedance so no
series resistance is needed. The resistor in the potentiometer
should be a low tempco (<50ppm/°C) and the resulting voltage
divider should have very low tempco <5ppm/°C. A digital
potentiometer such as the ISL95810 provides a low tempco
resistance and excellent resistor and tempco matching for trim
applications.
2N2905
0.001µF
+
–
0.001µF
10µF
EL8178
(UNBUFFERED)
V
2.5V/50mA
OUT
(BUFFERED)
V
OUT
OUT
to GND and connecting the
September 16, 2009
FN6327.7