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Synchro to Digital Converters or Resolver to Digital Converters 2S44RDC/SDC Series Two-channel products are 14 bit two-way tracking synchro to digital converters or resolver to digital converters. They are packaged by 32-pin metal cases. They feature small sizes, light weights, high reliability and high anti-interference resistance etc.

Accuracy : ±5.3 arc min
Power supply voltage : +5V,±15V,±5.3V
Resolution : 14 bits

Product Detail

1 FEATURES( Outline is shown in Fig 1, Classifications are shown in Tab 1. ) of 2S44RDC/SDC Series Two-channel Synchro/Resolver-to-Digital Converter

32-wire metal case package
Two-way independent converter, sharing the same data line
Resolution: 14bit
Accuracy: ±5.3′
High tracking rate
Pin-to-pin compatible with AD Company AD2S44 product

1 Product classification

Synchro

Resolver

M2S44SDC-61-115/11.8

M2S44SDC-412

H2S44SDC-61-115/11.8

H2S44SDC-412

M2S44RDC-418

M2S44RDC-618

M2S44RDC-668

M2S44RDC-658

H2S44RDC-418

H2S44RDC-618

H2S44RDC-668

H2S44RDC-658

2 APPLICATIONS of 2S44RDC/SDC Series Two-channel Synchro to Digital converters or Resolver to Digital Converters

Antenna monitoring
Artillery control system
Digital servo-controlled system
Coordinate transformation
Platform control system

3 GENERAL DESCRI PTION of 2S44RDC/SDC Series Two-channel Synchro to Digital converters or Resolver to Digital Converters

Series 2S44RDC/SDC products are 14 bit two-way tracking synchro to digital converters or resolver to digital converters. They are packaged by 32-pin metal cases. They feature small sizes, light weights, high reliability and high anti-interference resistance etc.

Series 2S44RDC/SDC are two-channel converters, the two channels are independent, i.e. the two channels have independent reference voltage and input signal. Output data of 2S44RDC/SDC are connected to external data bus by 14bit output latch. The two channels are in common. The channels are selected by two control line: A/ and .

4 TECHNICAL SPECIFICATIONS ( Tab 2, Tab 3 ) of 2S44RDC/SDC Series Two-channel Synchro to Digital converters or Resolver to Digital Converters

Table2 Nominal conditions and recommended operating conditions

Absolute max nominal value

power supply voltage Vs:±17V

Storage temperature range:-55~+125℃(H2S44)

-40~+105℃(M2S44)

Recommended working conditions

power supply voltage Vs:±15V

reference voltage(effective value)Vref:2~115V

signal voltage(effective value)VI:2~90V

reference frequency f: 50Hz~10kHz

operating temperature range TA: -55~+125℃(H2S44)

-40~+85℃(M2S44)

Table3 Electrical characteristics

Characteristics			Conditions	×2S44RDC/SDC Business military standard (Q/HW30826-2006)		Units
				Min	Max
Accuracy			0°~360°	-5.3	5.3	Arc min
Resolution				14	—	bit
Output		VoutHi VoutLo		2.4 —	— 0.8	V
Tracking velocity Repeatability Operating frequency Band width				20 — 2.6k —	— 1 50 100	Rev/s LSB Hz Hz
input	VilLo VIHi			— 2.4	0.8 —	V
Gate time of channel tp Time to data stable when A/B state changes Time to data in high impedance when OE is logic “1” power dissipation				200 — — —	— 640 200 1.7	ns ns ns W

5 CIRCUIT THEORY DIAGRAM of 2S44RDC/SDC Series Two-channel Synchro to Digital converters or Resolver to Digital Converters

Functional block diagram of series 2S44RDC/SDC is shown in figure2. Series 2S44RDC/SDC consist of two independent conversion channels. Principle of operation of each channel is the same. Principle of operation of single channel reads as follows.

Internal differential isolation converts input signals of synchro(resolver) into orthogonal signals:
V1=KE0sinθsinωt
V2=KE 0 cosθsinωt
Where θis analogue input angle.
The two signals are multiplied by digital angle φ of internal up/down counter in sin/cos multiplier, thus result in error signal:
KE0 sinθcosφsinωt –KE0 cosθsinφsinωt=KE0 sin(θ-φ)sinωt
After error magnification, phase demodulator and integrator, the signal is inputted into VCO. If θ-φ≠0, VCO will output pulse, up/down counter will count untilθ-φ=0. During this process, converter continuously tracks changes of input angle.

Figure2 Functional block diagram
(1)Transfer function of single channel of the converter
Open loop transfer function

Closed loop transfer function

Figure3 Transfer function
(2)Channel select(A/

)
A/

is the channel select input. Logic “1” selects channel A and Logic “0” selects channel B. Data become valid 640ns A/ is toggled. Timing information is shown in fig. 4.
(3)Output enable(

)

is output enable input. When set to logic “1”,DB1~DB14 are in the high impedance state. When

is set to logic “0”,DB1~DB14 represent the angle of transducer shaft(see bit weights in Table 5) to within the stated accuracy of the converter. Data become valid 640ns after

is switched. Timing information is shown in fig.4.

Figure 4 Timing diagrams
(4)Built-in test(

)

is the built-in test error output. This provides an over velocity and fault indication signal for the channel selected via A/

. The error voltage of each channel is continuously monitored. When the error exceeds ±50bits for the currently selected channel,

is high level, the data are invalid. In normal condition,

is low level.

is valid for the selected channel approximately 50 ns after the change in the state of A/B.
Conditions which cause the

to output high level. It means the converter is in the state of no tracking.

Power-up transient response
Step input>1 degree
Excessive velocity
Signal failure
Converter/system failure

6 MTBF DIAGRAM ( Fig 5 ) of 2S44RDC/SDC Series Two-channel Synchro to Digital converters or Resolver to Digital Converters	7 PIN CONFIGURATIONS ( Fig6, Tab4 ) of 2S44RDC/SDC Series Two-channel Synchro to Digital converters or Resolver to Digital Converters

Figure 5 MTBF vs. temperature Figure 6 Pin out bottom view ( Note: According to GJB/Z 299B-98, assuming that ground is in good condition)

Table 4 Pin description

mnemonic

description

mnemonic

description

1~7

D8~D14

RLo(A)

RHi(A)

S4(A)

S3(A)

S2(A)

S1(A)

Digit output

Output enable

Channel selection

Error detection

Channel A reference input high pin

Channel A reference input low pin

Channel A signal input

26~32

S1(B)

S2(B)

S3(B)

S4(B)

RHi(B)

RLo(B)

GND

-Vs

+Vs

D1~D7

Channel B signal input

Channel B reference input high pin

Channel B reference input low pin

Power supply ground

-15V power supply

+15V power supply

Digit output

8 BIT WEIGHT TABLE ( Tab 5 ) of 2S44RDC/SDC Series Two-channel Synchro to Digital converters or Resolver to Digital Converters

Table 5 Bit weight table

Bit number	Weight (degrees)	Bit number	Weight (degrees)	Bit number	Weight (degrees)
1(MSB)	180.000 0	6	5.625 0	11	0.175 8
2	90.000 0	7	2.812 5	12	0.087 9
3	45.000 0	8	1.406 3	13	0.043 9
4	22.500 0	9	0.703 1	14	0.022 0
5	11.250 0	10	0.351 6

9 PACKAGE OUTLINE DIMENTION AND DISCRIPTION of 2S44RDC/SDC Series Two-channel Synchro to Digital converters or Resolver to Digital Converters

( Unit: mm) ( Fig 7,Tab 6 )

Figure 7 Package outline drawing

Table 6 Packaging case descriptions

Case model

Base material

Base coat

Lid(cap)

material

Lid(cap)

coat

Lead material

Lead coat

Sealing

method

Comments

UP4429-32

Kovar

(4J29)

Fe/Ni alloy

Kovar

(4J29)

Match sealing

Note: The temperature of soldered pins does not surpass 300℃ within 10 sec.

10 DESCRIPTIONS OF PRODUCT MODEL NUMBERING ( Fig 8 ) of 2S44RDC/SDC Series Two-channel Synchro to Digital converters or Resolver to Digital Converters

Figure8 Descriptions of product name

Note: When signal voltage and reference voltage(Z) above are not nominal, product name is given as follows:

(for example, reference voltage is 5V, signal voltage is 3V, name denotes 5/3)

Application notes:

Polar voltage of power supply should be correct.
When exceeding absolute maximum nominal value, it will possibly lead to damage to the device.
While assembling, the bottom of the product should be placed close to the board to avoid damage to the pins. If necessary, take shockproof measures.
Leads avoid bending, or it will easily lead to crack of insulator, which affects hermeticity.
When product is ordered, detailed electrical performance specifications should be referred to corresponding business standard.

Tags : 14 bits Synchro to Digital Converters +5V,±15V,±5.3V Resolver to Digital Converters ±5.3 arc min SDC RDC

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Subject : Synchro to Digital Converters or Resolver to Digital Converters 2S44RDC/SDC Series Two-channel

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