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MDSC/MDRC29 Series Digital to Synchro Converters or Digital to Resolver Converters product that converts the input binary signal to that of synchro or resolver. The input signal is compatible with DTL/TTL/CMOS level, and the output is 3-wire synchro or 4-wire resolver signal. This series of product continuously tracks the input 2-bit/14-bit/16-bit binary data, and outputs high-precision synchro/resolver signal after conversion. The product is equipped with power amplification circuit inside it, and its output power can reach 5W.

Accuracy : ±8 arc min(12 bits),±6 arc min(14 bits),±6 arc min(16 bits)
Power supply voltage : ±15V
Resolution : 12,14 or 16 bits

Product Detail

1.Features (see Fig. 1 for outside view, and Table 1 formodels)

Compatible with DTL/TTL/CMOS level
12-bit, 14-bit and 16-bit resolution
Short-circuit and overload protection
Metal case, with good heat rejection
Output power: 5W

Table1 Product models

12-bit		14-bit		16-bit
Synchro	Resolver	Synchro	Resolver	Synchro	Resolver
MDSC2912-411	MDRC2912-418	MDSC2914-411	MDRC2914-418	MDSC2916-411	MDRC2916-418
MDSC2912-412	MDRC2912-438	MDSC2914-412	MDRC2914-438	MDSC2916-412	MDRC2916-438
MDSC2912-421	MDRC2912-414	MDSC2914-421	MDRC2914-414		MDRC2916-414
MDSC2912-422	MDRC2912-415	MDSC2914-422	MDRC2914-415		MDRC2916-41-36/11.8
					MDRC2916-415

2. Scope of application of MDSC/MDRC29 Series Digital to Synchro Converters or Digital to Resolver Converters

Military servo control system
Antenna system
Radar measurement system
Navigation system
Cannon control system
Machine tool control

3. Description of MDSC/MDRC29 Series Digital to Synchro Converters or Digital to Resolver Converters

MDSC/MDRC29 series product is a converter that converts the input binary signal to that of synchro or resolver. The input signal is compatible with DTL/TTL/CMOS level, and the output is 3-wire synchro or 4-wire resolver signal. This series of product continuously tracks the input 2-bit/14-bit/16-bit binary data, and outputs high-precision synchro/resolver signal after conversion. The product is equipped with power amplification circuit inside it, and its output power can reach 5W.

4. Electrical performance (Table 2 and Table 3) of MDSC/MDRC29 Series Digital to Synchro Converters or Digital to Resolver Converters

Table 2 Rated conditions and recommended operating conditions

Max. absolute rating value

Supply voltage +VS: +13.5~+17.5V

Supply voltage -VS: -17.5~-13.5V

Storage temperature range: -40~100℃

Recommended operating conditions

Supply voltage +VS: +14.5~+16.5V

Supply voltage -VS: -16.5~-14.25V

Reference voltage (effective value) VRef*: 115V±5%

Signal voltage (effective value) V1*: 90V±5%

Reference frequency f*: 400Hz±10%

Range of operating temperature TA: -40℃~85℃

Note: * indicates it can be customized as per user’s requirement.|

Table 3 Electric characteristics

Parameter	MDRC/DSC2912		MDRC/DSC2914		MDRC/DSC2916		Unit
	Enterprise military standard (Q/HW30857-2006)
Resolution	12-bit		14-bit		16-bit		Bit
Accuracy	±8		±4		±4		Minute
Digital input	5	0	5	0	5	0	V
Reference voltage (effective value)	26, 36, 115V±10%﹡						V
Reference frequency	50, 400, 1.2K, 2K﹡						Hz
Output signal voltage (Effective value)	11.8, 26, 36, 90 (line-line, resolver or synchro)﹡						V
Output power	5						W

Note: * means the products with different frequency and different amplitude can be made according to the user’s needs.

5. Operating principle (Fig. 2 and Fig. 3) of MDSC/MDRC29 Series Digital to Synchro Converters or Digital to Resolver Converters

One of the distinctive characteristics of MDSC/MDRC29 series product is that it can neglect the change of radius vector. Each type of digital-to-syncrho/resolver converter must be provided with output sin and cos function signal, however, since the law of sin and cos function is not followed precisely all the time, its error can reach as high as ± 7%. In practical use, this error is not serious sometimes, but it is not allowed in the application of tracking rotating torque receiver or servo control loop. For MDSC/MDRC29 series product, this error can be reduced below 0.1%, which means that when the converter is used in a closed loop servo system, the closed-loop gain is independent of the input signal, thus avoiding undesired error resulting from change of reference signal.


Fig.2 Schematic diagram for DSC converter	Fig.2 Schematic diagram for DRC converter

6. Connection diagram for typical application (Fig. 4) of MDSC/MDRC29 Series Digital to Synchro Converters or Digital to Resolver Converters

DSC/DRC load connection
（1）Control transformer (CT)
The simplest design is using digital converter to synchro/resolver to drive the control transformer.
The min. power for driving CT is:

Where, V is line-line voltage, Zso is the impedance between nodes after the circuit from one output end of CT to other two rotor circuits is short-circuited (Zso=Rso+jXso).
For example: when the impedance of CT is ZS=700+j490, the line-line voltage is 90V, then

Fig. 4 Connection diagram for typical application

For the adjustment of CT load, it can be reduced through 3 capacitances at the output end, as shown as below:

The required power is: (VA) (unadjusted) x

In the above example, the capacitance is:

The required power after adjustment is:

In the design, it is required to note the errors that usually exist such as coil number, capacitance, inductance, etc. in CT.
Practical prompts for CT load adjustment:
① High precision capacitance is not required, an error of 20% is enough.
② Three capacitors must be used between S1 and S2, S2 and S3 as well as S3 and S1.
③ Withstand voltage and type of capacitance
For line-line voltage of 11.8V, the withstand voltage of capacitance between pins is 25VAC, and the type of capacitance is non-polar tantalum capacitance.
For line-line voltage of 90V, the withstand voltage of capacitance between pins is 150VAC, and it is allowed to use ceramic capacitance with low dielectric constant.
④ The load adjustment of resolver only requires two capacitances. One is connected between S1 and S3, and the other between S2 and S4.
（2）Control differential transducer (CDX)
The load of DSC in the equipment can be considered like CT load, but its equivalent impedance Z must be calculated like CT load, its value is generally 66%~80% of ZSO.
（3）Torque receiver (TR)
Compared with CT and CDX, it is relatively difficult to control the torque receiver (TR). Generally speaking, it requires an output amplifier. Because the change of radius vector of MDSC/MDRC28 series product can be neglected, it is more suitable for controlling TR than those devices with an error of ±7%. For an error with angle θ, the exciting current is:

Prompts:
①TR should not be blocked.
②The corresponding advance from reference input end to DSC shall conform to the provisions of TR.
③The reference input must be always applied on TR and converter.
The output voltage of DSC/DRC must completely match with the voltage required by TR.

7. MTBF curve (Fig. 5) of MDSC/MDRC29 Series Digital to Synchro Converters or Digital to Resolver Converters	8. Pin designation (Fig. 6, Table 4) of MDSC/MDRC29 Series Digital to Synchro Converters or Digital to Resolver Converters

Fig.5 MTBF-temperature curve (Note: according to GJB/Z299B-98, envisaged good ground condition)	Fig.6 Schematic diagram of pins (top view)

Table 4 Pin designation

Pin	Symbol	Function	Pin	Symbol	Function	Pin	Symbol	Function
1	1 (MSB)	Digital input 1	11	11	Digital input 11	21	S1	Signal output 1
2	2	Digital input 2	12	12	Digital input 12	22	+15V	+15V input
3	3	Digital input 3	13	13	Digital input 13	23	GND	Ground
4	4	Digital input 4	14	14	Digital input 14	24	NC	Leave unconnected
5	5	Digital input 5	15	15	Digital input 15 (12-bit and 14-bit are lefe unconnected)	25	-15V	-15V input
6	6	Digital input 6	16	16	Digital input 16 (12-bit and 14-bit areleft unconnected)	26	NC	Leave unconnected
7	7	Digital input 7	17	NC	Leave unconnected	27	RLo	Low end of reference input
8	8	Digital input 8	18	S4	Signal output 4	28	RHi	High end of reference input
9	9	Digital input 9	19	S3	Signal output 3
10	10	Digital input 10	20	S2	Signal output 2

Notes: ① Digital input: DSC/DRC2912 is 1~12, altogether 12 bits; DSC/DRC2914 is 1~14, altogether 14 bits; DSC/DRC2916 is 1~16, altogether 16 bits.
② “1” is the highest bit (MSB);
③ S1, S2, S3 and S4: output are used for synchro or resolver, among them, S4 is only used for resolver;
④ RHi and RLo: reference input;
⑤GND: common ground of power supply and input signal;
⑥±15V: power supply.

9. Table of weight values (Table 5) of MDSC/MDRC29 Series Digital to Synchro Converters or Digital to Resolver Converters

Table 5 Table of weight values

Bit	Angle	Bit	Angle	Bit	Angle
1	180.000 0	6	5.625 0	11	0.175 8
2	90.000 0	7	2.812 5	12 (for 12-bit LSB)	0.087 9
3	45.000 0	8	1.406 3	13	0.043 9
4	22.500 0	9	0.703 1	14 (for 14-bit LSB)	0.022 0
5	11.250 0	10	0.351 6

10. Package specifications (unit: mm) (Fig. 7) of MDSC/MDRC29 Series Digital to Synchro Converters or Digital to Resolver Converters

Fig. 7 Outside view and dimensions of package

11. Part numbering key (Fig. 8) of MDSC/MDRC29 Series Digital to Synchro Converters or Digital to Resolver Converters

Fig. 8 Part numbering key

Note: when the above signal voltage and reference voltage (Z) are non-standard, they shall be given as follows:

(e.g. reference voltage 40V and signal voltage 38V are expressed as -40/38)

Application notes

Do not apply reference voltage of 115V to the device of 26V.
The voltage of power supply shall not exceed the specified range.
Do not connect reference RHi and RLo to other pins.
Supply voltage must be kept to the voltage of correct polarity.
When the max. absolute rating value is exceeded, the device may be damaged.
Upon assembly, the bottom of the product shall fit to the circuit board closely so as to avoid damage of pins, and shockproof provision shall be added, if necessary.
When the user places an order for the product, detailed electric performance indexes shall refer to the relevant enterprise standard.

Tags : 12,14 or 16 bits Digital to Synchro Converters ±15V Digital to Resolver Converters ±8 arc min(12 bits),±6 arc min(14 bits),±6 arc min(16 bits)Digital to Resolver Converters

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