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AD7890BR-4 Folha de dados(PDF) 9 Page - Analog Devices

Nome de Peças AD7890BR-4
Descrição Electrónicos  LC2MOS 8-Channel, 12-Bit Serial, Data Acquisition System
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

AD7890BR-4 Folha de dados(HTML) 9 Page - Analog Devices

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AD7890
–9–
REV. A
tions occur on successive integer LSB values (i.e., 1 LSB,
2 LSBs, 3 LSBs . . . ). Output coding is straight (natural)
binary with 1 LSB = FS/4096 = 4.096 V/4096 = 1 mV. The
ideal input/output transfer function is shown in Table II.
+2.5V
REFERENCE
2k
TO ADC
REFERENCE
CIRCUITRY
200
Ω*
VINX
AGND
MUX OUT
AD7890-4
*EQUIVALENT ON-RESISTANCE OF MULTIPLEXER
REF OUT/
REF IN
6k
9.38k
Figure 3. AD7890-4 Analog Input Structure
Table II. Ideal Input/Output Code Table for the AD7890-4
Digital Output
Analog Input
1
Code Transition
+FSR – 1 LSB
2 (4.095 V)
111 . . . 110 to 111 . . . 111
+FSR – 2 LSBs (4.094 V)
111 . . . 101 to 111 . . . 110
+FSR – 3 LSBs (4.093 V)
111 . . . 100 to 111 . . . 101
AGND + 3 LSBs (0.003 V)
000 . . . 010 to 000 . . . 011
AGND + 2 LSBs (0.002 V)
000 . . . 001 to 000 . . . 010
AGND + 1 LSB (0.001 V)
000 . . . 000 to 000 . . . 001
NOTES
1FSR is full-scale range and is 4.096 V with REF IN +2.5 V.
21 LSB = FSR/4096 = 1 mV with REF IN = +2.5 V.
AD7890-2
The analog input section for the AD7890-2 contains no biasing
resistors and the selected analog input connects to the multi-
plexer and in cases where MUX OUT is connected to SHA IN
this is followed by the high input impedance stage of the track/
hold amplifier. The analog input range is, therefore, 0 V to +2.5 V
into a high impedance stage with an input current of less than
50 nA. The designed code transitions occur on successive integer
LSB values (i.e., l LSB, 2 LSBs, 3 LSBs . . . FS-1 LSBs). Out-
put coding is straight (natural) binary with 1 LSB = FS/4096 =
2.5 V/4096 = 0.61 mV. The ideal input/output transfer function
is shown in Table III.
Table III. Ideal Input/Output Code Table for the AD7890-2
Digital Output
Analog Input
1
Code Transition
+FSR – 1 LSB
2 (2.499390 V)
111 . . . 110 to 111 . . . 111
+FSR – 2 LSBs (2.498779 V)
111 . . . 101 to 111 . . . 110
+FSR – 3 LSBs (2.498169 V)
111 . . . 100 to 111 . . . 101
AGND + 3 LSBs (0.001831 V)
000 . . . 010 to 010 . . . 011
AGND + 2 LSBs (0.001221 V)
000 . . . 001 to 001 . . . 010
AGND + 1 LSB (0.000610 V)
000 . . . 000 to 000 . . . 001
NOTES
1FSR is full-scale range and is 2.5 V with REF IN = +2.5 V.
21 LSB = FSR/4096 = 0.61 mV with REF IN = +2.5 V.
CIRCUIT DESCRIPTION
Analog Input Section
The AD7890 is offered as three part types, the AD7890-10
which handles a
±10 V input voltage range, the AD7890-4
which handles a 0 V to +4.096 V input range and the AD7890-2
which handles a 0 V to +2.5 V input voltage range.
AD7890-10
Figure 2 shows the analog input section for the AD7890-10.
The analog input range for each of the analog inputs is
±10 V
into an input resistance of typically 33 k
Ω. This input is benign
with no dynamic charging currents with the resistor attenuator
stage followed by the multiplexer and in cases where MUX
OUT is connected to SHA IN this is followed by the high input
impedance stage of the track/hold amplifier. The designed code
transitions occur on successive integer LSB values (i.e., 1 LSB,
2 LSBs, 3 LSBs...). Output coding is 2s complement binary
with 1 LSB – FS/4096 = 20 V/4096 = 4.88 mV. The ideal input/
output transfer function is shown in Table I.
+2.5V
REFERENCE
2k
TO ADC
REFERENCE
CIRCUITRY
7.5k
30k
200
Ω*
10k
VINX
AGND
MUX OUT
AD7890-10
*EQUIVALENT ON-RESISTANCE OF MULTIPLEXER
REF OUT/
REF IN
Figure 2. AD7890-10 Analog Input Structure
Table I. Ideal Input/Output Code Table for the AD7890-10
Digital Output
Analog Input
1
Code Transition
+FSR/2 – 1 LSB
2 (9.995117 V)
011 . . . 110 to 011 . . . 111
+FSR/2 – 2 LSBs (9.990234 V)
011 . . . 101 to 011 . . . 110
+FSR/2 – 3 LSBs (9.985352 V)
011 . . . 100 to 011 . . . 101
AGND + 1 LSB (0.004883 V)
000 . . . 000 to 000 . . . 001
AGND (0.000000 V)
111 . . . 111 to 000 . . . 000
AGND – 1 LSB (–0.004883 V)
111 . . . 110 to 111 . . . 111
–FSR/2 + 3 LSBs (–9.985352 V)
100 . . . 010 to 100 . . . 011
–FSR/2 + 2 LSBs (–9.990234 V)
100 . . . 001 to 100 . . . 010
–FSR/2 + 1 LSB (–9.995117 V)
100 . . . 000 to 100 . . . 001
NOTES
1FSR is full-scale range and is 20 V with REF IN = +2.5 V.
21 LSB = FSR/4096 = 4.883 mV with REF IN = +2.5 V.
AD7890-4
Figure 3 shows the analog input section for the AD7890-4. The
analog input range for each of the analog inputs is
± 10 V into
an input resistance of typically 15 k
Ω. This input is benign with
no dynamic charging currents with the resistor attenuator stage
followed by the multiplexer and in cases where MUX OUT is
connected to SHA IN this is followed by the high input imped-
ance stage of the track/hold amplifier. The designed code transi-


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