AM6012D Ver la hoja de datos (PDF) - Philips Electronics
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AM6012D Datasheet PDF : 11 Pages
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Philips Semiconductors Linear Products
12-Bit multiplying D/A converter
Product specification
AM6012
VR+
RIN
VIN
R15 = R14 = RIN
VIN
R14
14
15 I15
R15
VR–
AM6012
IREF
REFERENCE
AMPLIFIER
18
IO
IO
19
IO + IO = IFS
FOR ALL INPUT CODES
COMP
CC
V–
V+
0.1
0.1
20
V–
22µF TANTALUM
(NOTE 5)
REFERENCE CONFIGURATION
R14
R15
RIN
CC
IREF
Positive reference
VR+
0V
N/C
0.01µF
VR+/R14
Negative reference
0V
VR–
N/C
0.01µF
–VR–/R14
Lo impedance bipolar reference
VR+
0V
VIN1
(VR+/R14) + (VIN/RIN)2
Hi impedance bipolar reference
VR+
VIN
N/C1
(VR+ – RIN) / R143
Pulsed reference4
VR+
0V
VIN
No Cap
(VR+/R14) + (VIN/RIN)
NOTES:
1. The compensation capacitor is a function of the impedance seen at the +VREF input and must be at least 5pF x R14(eq) in kΩ. For R14 < 800Ω no capacitor is necessary.
2. For negative values of VIN, VR+ / R14 must be greater than –VIN max / RIN so that the amplifier is not turned off.
3. For positive values of VIN, VR+ must be greater than –VIN max so the amplifier is not turned off.
4. For pulsed operation, VR+ provides a DC offset and may be set to zero in some cases. The impedance at Pin 14 should be 800Ω or less.
5. For optimum settling time, decouple V– with 20Ω and bypass with 22µF tantalum capacitor.
6. Reference current and reference resistor — there is a 1-to-4 scale factor between the reference current (IREF) and the full-scale output current (IFS).
If VREF = +10V and IFS = 4mA, the value of the R14 is:
4 x 10V
R14 + 4mA + 10kW
R14 + R15
a. Reference Amplifier Biasing
Minimum Size
Compensation Capacitor
(IFS = 4mA, IREF = 1.0mA)
R14(EQ) (kΩ)
10
5
2
1
.5
CC (pF)
50
25
10
5
0
NOTE:
A 0.01µF capacitor is recommended for fixed
reference operation.
August 31, 1994
b.
Figure 2.
782
Reference Amplifier
Frequency Response
6
4
R14 (EQ) = 2kΩ
CC = 10pF
2
0
LARGE SIGNAL = 50%
–2 MODULATION OF 4mA
FULL SCALE CURRENT
–4
SMALL SIGNAL = 1%
–6 MODULATION OF 2mA
FULL SCALE CURRENT
–8
.01
0.1
1.0
10
FREQUENCY MHz
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