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AD7750 数据表(PDF) 4 Page - Analog Devices

部件名 AD7750
功能描述  Product-to-Frequency Converter
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD7750 数据表(HTML) 4 Page - Analog Devices

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AD7750
–4–
REV. 0
PIN FUNCTION DESCRIPTIONS
Pin
No.
Mnemonic
Descriptions
1VDD
Power Supply Pin, 5 V nominal
± 5% for specifications.
2
G1
Gain Select, Digital Input. This input selects the gain for the Channel 1 differential input. When G1 is
low, the gain is 1 and when G1 is high, the gain is 16. See Analog Inputs section.
3, 4
V1(+), V1(–)
Channel 1 Differential Inputs. See the Analog Inputs section for an explanation of the maximum input
signal ranges. Channel 1 has selectable gains of 1 and 16. The absolute maximum rating is
±6 V for each
pin. The recommended clamp voltage for external protection circuitry is
±5 V.
5
AGND
The Analog Ground reference level for Channels 1 and 2 differential input voltages. Absolute voltage
range relative to DGND pin is –20 mV to +20 mV. The Analog Ground of the PCB should be connected
to digital ground by connecting the AGND pin and DGND pin together at the DGND pin.
6, 7
V2(+), V2(–)
Channel 2 Differential Inputs. See the Analog Inputs section for an explanation of the maximum input
signal ranges. Channel 2 has a fixed gain of 2. The absolute maximum rating is
±6 V for each pin. The
recommended clamp voltage for external protection circuitry is
±5 V.
8
REFOUT
Internal Reference Output. The AD7750 can use either its own internal 2.5 V reference or an external
reference. For operation with the internal reference this pin should be connected to the REFIN pin.
9
REFIN
Reference Input. The AD7750 can use either its own internal 2.5 V reference or an external reference.
For operation with an external reference, a 2.5 V
± 8%, reference should be applied at this pin. For op-
eration with an internal reference, the REFOUT pin should be connected to this input. For both internal
or external reference connections, an input filtering capacitor should be connected between the REFIN
pin and Analog Ground.
10
DGND
The Ground and Substrate Supply Pin, 0 V. This is the reference ground for the digital inputs and out-
puts. These pins should have their own ground return on the PCB, which is joined to the Analog Ground
reference at one point, i.e., the DGND pin.
11
FS
Frequency Select, Digital Input. This input, along with S1 and S2, selects the operating mode of the
AD7750—see Table I.
13, 12
S1, S2
Mode Selection, Digital Inputs. These pins, along with FS, select the operating mode of the AD7750—
see Table I.
14
ACDC
High-Pass Filter Control Digital Input. When this pin is high, the high-pass filter is switched into the
signal path of Channel 1. When this pin is low, the high-pass filter is removed. Note when the filter is off
there is a fixed time delay between channels; this is explained in the Functional Description section.
15
CLKIN
An external clock can be provided at this pin. Alternatively, a crystal can be connected across CLKIN
and CLKOUT for the clock source. The clock frequency is 3.58 MHz for specified operation.
16
CLKOUT
When using a crystal, it must be connected across CLKIN and CLKOUT. The CLKOUT can drive
only one CMOS load when CLKIN is driven externally.
17
REVP
Reverse Polarity, Digital Output. This output becomes active high when the polarity of the signal on
Channel 1 is reversed. This output is reset to zero at power-up. This output becomes active only when
there is a pulse output on F1 or F2. See Reverse Polarity Indicator section.
18
FOUT
High-Speed Frequency Output. This is also a fixed-width pulse stream that is synchronized to the
AD7750 CLKIN. The frequency is proportional to the product of Channel 1 and Channel 2 or the signal
on either channel, depending on the operating mode—see Table I. The output format is an active high
pulse approximately 90 ms wide—see Digital-to-Frequency Conversion section.
20, 19
F1, F2
Frequency Outputs. F1 and F2 provide fixed-width pulse streams that are synchronized to the AD7750
CLKIN. The frequency is proportional to the product of Channel 1 and Channel 2—see Table I. The
output format is an active low pulse approximately 275 ms wide—see Digital-to-Frequency Conver-
sion section.


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