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参数资料
| 型号： | ISL21400 |
| 厂商： | Intersil Corporation |
| 英文描述： | Programmable Temperature Slope Voltage Reference(可编程温度斜率电压基准) |
| 中文描述： | 可编程温度斜坡电压基准（可编程温度斜率电压基准） |
| 文件页数： | 14/17页 |
| 文件大小： | 439K |
| 代理商： | ISL21400 |
14
FN8091.1
April 24, 2007
Applications Information
Power-Up Considerations
The ISL21400 has on-chip EEPROM memory storage for
the DAC and gain settings of the device. These settings
must be recalled correctly on power-up for proper operation.
Normally there are no issues with recall, although it is always
best to provide a smooth, glitch-free power-up waveform on
V
CC
. Adding a small 0.1
μ
F capacitor at the device V
CC
will
help with power-up as well as V
OUT
load changes.
Noise Performance
The output noise voltage in a 0.1Hz to 10Hz bandwidth is
typically 90μV
P-P
. The noise measurement is made with a
bandpass filter made of a 1 pole high-pass filter with a corner
frequency at 0.1Hz and a 2-pole low-pass filter with a corner
frequency at 12.6Hz to create a filter with a 9.9Hz
bandwidth. Load capacitance up to 5000pF can be added
but will result in only marginal improvements in output noise
and transient response. The output stage of the ISL21400 is
not designed to drive heavily capacitive loads. For high
impedance loads, an R-C network can be added to filter high
frequency noise and preserve DC control.
Output Voltage Programming Considerations
Setting and controlling the output voltage of the ISL21400
can be done easily by breaking down the components into
temperature variant and invariant, and setting them
separately. Let’s use Equation 1 to derive separate
Reference Output and Output Temp Slope equations:
The first term controls the output DC value, and the second
term controls the Temp slope, where
DC OUTPUT CONTROL DISCUSSION
The reference term yields Equation 2 for Reference Output:
Note that the DC term is dependent on the 1.20V reference
voltage, which is constant, the overall gain, A
V
, and the
Reference gain, A
REF
. Since the product A
V
* A
REF
ranges
from 0 to 4, the total reference DC output can range from
0.0V to 4.8V. In order to get the 4.8V output, V
CC
must be
greater than 4.8V by the output dropout plus any overhead
for output loading (the specification for V
OUT
= 5.0V is listed
with V
CC
= 5.5V). The Resolution of V
OUT
(DC) control
changes with A
V
, so that with a 4.80V full scale output
(A
V
= 4), the resolution is 4.80/255 or 18.8mV/bit. With
A
V
= 1, the resolution is 4.7mV/bit.
TEMP SENSE CONTROL DISCUSSION
Equation 2 yields this expression, Equation 3, for Temp
Slope:
Since V
TS
= K(T - T
0
), the slope term is dependent on the
base temp slope of the device, K (-2.1mV/°C), and the gain
terms A
V
and A
TS
. This gives a formula (Equation 4) for the
portion of V
OUT
at a specific temperature:
The product A
V
*A
TS
ranges from -4 to 4, so the Temperature
Slope can range from -8.4 to +8.4mV/°C, which is
independent of the output DC voltage. The resolution of
Slope control is determined by this range (±8.4mV/°C) and
the gain terms, and will vary from 65.8
μ
V/°C/bit (A
V
= 4)
down to 16.2
μ
V/°C/bit (A
V
= 1).
At T = T
0
= +25°C, V
OUT
(TS) = 0, no changes in A
TS
will
cause a change in V
OUT
, and V
OUT
will only vary with the
V
OUT
(DC) control. As temperature increases or decreases,
from T = +25°C, V
OUT
will then change according to the
programmed Temp Slope.
SIGNALS
FROM THE
MASTER
SIGNALS FROM
THE SLAVE
SIGNAL AT SDA
S
T
A
R
T
IDENTIFICATION
BYTE WITH R/W = 0
ADDRESS
BYTE
A
C
K
A
C
K
0
0
0
1
1
S
T
O
P
A
C
K
0
1
0
1
1
IDENTIFICATION
BYTE WITH R/W = 1
A
C
K
S
T
A
R
T
LAST READ
DATA BYTE
FIRST READ
DATA BYTE
A
C
K
A
A
A
0
0 0 0
0
A A A
FIGURE 18. RANDOM ADDRESS READ SEQUENCE
V
OUT
A
V
V
REF
---------
{
A
V
V
TS
-------------------–
+
=
A
V
V
REF
A
REF
}
=
A
V
V
TS
A
TS
{
}
""
+
Reference Term
Temp Slope Term
+
A
REF
---------
=
(ranges from 0 to 1)
A
TS
-------------------–
(ranges from -1 to +1)
=
V
OUT
(DC)
A
=
V
V
REF
A
REF
(EQ. 2)
V
OUT
TS
(
)
A
V
V
TS
A
TS
=
(EQ. 3)
V
OUT
TS
(
)
A
V
K
A
TS
T
T
0
–
(
)
=
(EQ. 4)
ISL21400
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