AD694ARZ Circuit Board Chips Integrated Circuit Chip 4–20 mA
Transmitter
STOCK LIST
| C.I SN74LS244N | TI | 64AH70K/5ACCLLK | DIP-20 |
| C.I 74HC238D | | 1640 | SOP-16 |
| C.I P8255A5 (not L8320146) | INTEL | L5171029 | DIP-40 |
| C.I HEF4051BT | | 1622+ | SOP-16 |
C.I SERIAL NUMBER
IBUTTON DS1990A-F5+ | DALLAS | 1631 | BUTTON |
| C.I M27C2001-10F1 | ST | 1211K | CDIP 32 |
| TRANS IRF540NPBF | IR | P632D | TO-220 |
| TRIAC BT151-500R | | PJA603 | TO-220 |
| C.I MC908MR16CFUE | FREESCAL | 1341 | LQFP-64 |
| C.I 74HC245DB,118 | | 1619 | SSOP-20 |
| C.I MCP130T-315I/TT | MICROCHIP | PLEP | SOT23-3 |
| DIODO RGF1M-E3/67A | VISHAY | RM/5B | SMA |
| C.I 74HC244DB,118 | | 1418 | SSOP-20 |
| C.I 74LVC139D | | 1213 | SOP-16 |
| C.I LD1086V33 | ST | 829/833 | TO-220 |
| DIODO TPD4E001DBVR | TI | NFY5 | SOT23-6 |
| TRIAC BT151-500R | | PJA603 | TO-220 |
| S5M-E3/57T | VISHAY | 1632/5M | SMC |
| DIODO LED VSLB3940 | VISHAY | 10+ | DIP-2 |
| MMBT3906LT1G | ON | 1642/2A | SOT-23 |
| DIODO BAS16LT1G | ON SEMI | 1640/A6 | SOT-23 |
| MBR3045CTP | DIODES | 1024 | TO-220 |
| GBU6M | VISHAY | 1510L | DIP-4 |
| GBU608 | SEP | 16+ | DIP-4 |
SENSOR KTY11-6
Q62705-K246 | | T6/S76 | TO-92 |
| C.I AD590KH | AD | 1406 | CAN3 |
| C.I ICL7660CBAZ | INTERSIL | V1608BA | SOP-8 |
| C.I PC817C | SHARP | H41 | DIP-4 |
| TRANS TIP127 (ROHS) | ST | 608 | TO-220 |
| OPTO 4N25M | FSC | 645Q | DIP-6 |
Feature
Single Chip Solution, Contains Internal Oscillator and
Voltage Reference
No Adjustments Required
Interfaces to Half-Bridge, 4-Wire LVDT
DC Output Proportional to Position
20 Hz to 20 kHz Frequency Range
Unipolar or Bipolar Output
Will Also Decode AC Bridge Signals
Outstanding Performance
Linearity: 0.05%
Output Voltage: 11 V
Gain Drift: 20 ppm/ C (typ)
Offset Drift: 5 ppm/ C (typ)
PRODUCT HIGHLIGHTS
1. The AD698 offers a single chip solution to LVDT signal
conditioning problems. All active circuits are on the monolithic
chip with only passive components required to complete the
conversion from mechanical position to dc voltage.
2. The AD698 can be used with many different types of position
sensors. The circuit is optimized for use with any LVDT, including
half-bridge and series opposed, (4 wire) configurations. The AD698
accommodates a wide range of input and output voltages and
frequencies.
3. The 20 Hz to 20 kHz excitation frequency is determined by a
single external capacitor. The AD698 provides up to 24 volts rms to
differentially drive the LVDT primary, and the AD698 meets its
specifications with input levels as low as 100 millivolts rms.
4. Changes in oscillator amplitude with temperature will not affect
overall circuit performance. The AD698 computes the ratio of the
secondary voltage to the primary voltage to determine position and
direction. No adjustments are required.
5. Multiple LVDTs can be driven by a single AD698 either in series
or parallel as long as power dissipation limits are not exceeded.
The excitation output is thermally protected.
6. The AD698 may be used as a loop integrator in the design of
simple electromechanical servo loops.
7. The sum of the transducer secondary voltages do not need to be
constant.
ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage (+VS to –VS) . . . . . . . . . . . . . . . . .
36 V
Storage Temperature Range P Package . . . . . . . . . . . . . . . .
. . . . . . . . . –65°C to +150°C
Q Package . . . . . . . . . . . . . . . . . . . . . . . . –65°C to
+150°C
Operating Temperature Range AD698SQ . . . . . . . . . . . . . . . .
. . . . . . . . –55°C to +125°C
AD698AP . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to
+85°C
Lead Temperature Range (Soldering 60 sec) . . . . . . . . +300°C
Power Dissipation Derates above +65°C
P Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . 12 mW/°C
Q Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. 12 mW/°C
