ECRI Microelectronics

HHLY-X Series High-Precision Constant Current Source

Features:
Single output: 1~60mA

Positive and negative symmetric output: ±1~±60 mA
High accuracy: ±0.2%
Low temperature drift: 1.5ppm/℃(min.)
Low time drift: 10 ppm/℃
Hybrid integrated metal airtight case package
Volume: 25.48×20.58×6mm3(HHLY-1)
20.06×15.02×6mm3(HHLY-2)
25.03×22.84×6mm3(HHLY-3, HHLY-4)
Quality class: commercial, industrial, military and aerospace class
Operating temperature range: 0~70℃, -40~85℃, -55~85℃, -55~125℃


1.Description of HHLY-X Series High-Precision Constant Current Source:

High-precision constant current source is a type of device used for precision current reference. The constant current source is divided into two types, i.e. current source and current sink, the source is for flowout and the sink is for flow-in. Both the accuracy and stability of high-precision constant current source are relatively high, in addition, the sampling resistance can be externally connected depending on the magnitude of current, which can be designed by the user, so its use is flexible and convenient. In addition, if the user has other requirements, we can customize the product.

2.Application of HHLY-X Series High-Precision Constant Current Source:

Precision D/A, A/D conversion circuit
Precision comparator circuit
High precision instrument

3.Schematic block diagram of HHLY-X Series High-Precision Constant Current Source


Block diagram for operating principle of HHLY-3 high-precision constant current source

4.Pin designation of HHLY-X Series High-Precision Constant Current Source



Pin

Symbol

Function

Pin

Symbol

Function

1

GNDC

Case ground

9

OUT2

Current output 2

2

NC

No connection

10

NC

No connection

3

NC

No connection

11

OUT1

Current output 1

4

V1-

Negative Supply voltage

12

NC

No connection

5

NC

No connection

13

V1+

Positive Supply voltage

6

NC

No connection

14

GND

Power ground

7

NC

No connection

15

V2+

Positive power of thermostatic bath

8

NC

No connection

16

GND2

Negative power of thermostatic bath

Pin arrangement of HHLY-1 high-precision constant-current source (sink)


Pin

Symbol

Meaning

Pin

Symbol

Meaning

1

NC

No connection

6

R1

5mA current select

2

GND

Power ground

7

R2

5mA current select

3

OUT1

Output 1

8

NC

No connection

4

OUT2

Output 2

9

V+

Positive power source

5

NC

No connection

10

Vr

Reference voltage output

Pin arrangement of HHLY-2 high-precision constant-current source


Pin

Symbol

Function

Pin

Symbol

Function

1

V-

Constant current source -15V

9

NC

No connection

2

Io+

Output of positive constant current source

10

Rs-

Rs- of negative constant current source

3

Io-

Output of negative constant current source

11

Rs-

Rs- (connected to V-) of negative constant current source

4

NC

No connection

12

Rs+

Rs+ of positive constant current source

5

NC

No connection

13

V+

Constant current source +15V

6

NC

No connection

14

GND

GND of constant current source

7

NC

No connection

15

NC

No connection

8

NC

No connection

16

Rs+

Rs+ (connected to V+) of positive constant current source

Pin arrangement of HHLY-3 high-precision constant-current source


Pin

Symbol

Function

Pin

Symbol

Function

1

NC

No connection

17

NC

No connection

2

NC

No connection

18

GND3

GND of power supply of thermostatic bath

3

NC

No connection

19

NC

No connection

4

NC

No connection

20

NC

No connection

5

NC

No connection

21

V2+

Power 27V of thermostatic bath

6

V1-

Negative constant current source –15V

22

NC

No connection

7

Io-

Output of negative constant current source

23

GND2

GND of positive constant current source

8

Rs-

Rs- (externally connected) of negative constant current source

24

Rs+

Rs+ of positive constant current source

9

Rs-

Rs- of negative constant current source

25

Io+

Output of positive constant current source

10

GND1

GND of negative constant current source

26

Rs+

Rs+ of positive constant current source

11

NC

No connection

27

V1+

Power of positive constant current source

12

NC

No connection

28

NC

No connection

13

NC

No connection

29

NC

No connection

14

NC

No connection

30

NC

No connection

15

NC

No connection

31

NC

No connection

16

NC

No connection

32

NC

No connection

Pin arrangement of HHLY-4 high-precision constant-current source

5.Electric performance of circuit of HHLY-X Series High-Precision Constant Current Source

Electric characteristics of HHLY-1 high-precision constant current source (dual-path 1mA)

Characteristics

Symbol

Condition

(Unless otherwise specified,

-55℃≤TC≤85℃

V1+= 15V±0.1V

V1-=-15V±0.1V

V2+=27V±0.1V

VL=15V±0.1V

RL1=RL2=6kΩ)

Limit value

Unit

Min.

Max.

Output current 1

Io1

Start settling time 1.5 min

0.998

1.002

mA

Output current 2

Io2

0.998

1.002

mA

Time drift

St1

TA=25℃, 3h

-10×10-6

10×10-6

1/h

St2

Temperature coefficient of output current

STI1


-

1.5×10-6

1/℃

STI2

Linear adjustment

SV1

TA=25℃, VL=12V→30V

-5×10-5

5×10-5

1/V

SV2

Output impedance

ZO1

TA=25℃

10

-

ZO2

Asymmetry

A

TA=25℃

-0.1

0.1

%

Electric characteristics of HHLY-2 high-precision constant current source (single 5mA)

Characteristics

Symbol

Condition

(Unless otherwise specified,

-55℃≤TC≤125℃

V+=15V±0.1V

RL=750Ω)

Limit value

Unit

Min.

Max.

Output current

Io

V+=12V~30V, start settling time 1.5 min

4.99

5.01

mA

Time drift

St

TA=25℃, 3h

-1.5×10-5

1.5×10-5

1/h

Temperature coefficient of output current

STI


-

10×10-6

1/℃

Linear adjustment

SV

TA=25℃,V+=12V→30V

-5×10-5

5×10-5

1/V

Output impedance

ZO

TA=25℃

10

-

Electric characteristics of HHLY-3 high-precision constant current source (positive and negative symmetric ±10mA)

Characteristics

Symbol

Condition

(Unless otherwise specified,

-55℃≤TC≤125℃

V+= 15V±0.1V

V-= -15V±0.1V

RL1=RL2=500Ω)

Limit value

Unit

Min.

Max.

Positive output current

Io1

Symmetric output, start settling time 1.5 min

9.98

10.02

mA

Negative output current

Io2

-10.02

-9.98

Time drift

St1

TA=25℃,3h

-1.5×10-5

1.5×10-5

1/h

St2

Temperature coefficient of output current

STI1


-

10×10-6

1/℃

STI2

Linear adjustment

SV1

TA=25℃,

V+=15V→18V

V-=-15V→-18V

-5×10-5

5×10-5

1/V

SV2

Output impedance

ZO1

TA=25℃

10

-

ZO2

Asymmetry

A

TA=25℃

-0.1

0.1

%

Electric characteristics of HHLY-4 high-precision constant current source (positive and negative symmetric ±40mA)

Characteristics

Symbol

Condition

(Unless otherwise specified,

-55℃≤TC≤85℃

V1+=15V±0.1V

V1-=-15V±0.1V

V2+=27V±0.1V

RL1=RL2=100Ω)

Limit value

Unit

Min.

Max.

Positive output current

Io1

Symmetric output, start settling time 1.5 min

39.92

40.08

mA

Negative output current

Io2

-40.08

-39.92

Time drift

St1

TA=25℃, 3h

-10×10-6

10×10-6

1/h

St2

Temperature coefficient of output current

STI1


-

2×10-6

1/℃

STI2

Linear adjustment

SV1

TA=25℃,

V1+=15V→18V

V1-=-15V→-18V

-5×10-5

5×10-5

1/V

SV2

-5×10-5

5×10-5

Output impedance

ZO1

TA=25℃

10

-

ZO2

Asymmetry

A

TA=25℃

-0.1

0.1

%


6.Characteristic curve

Time drift characteristic curve of HHLY-3 high-precision constant current source


MTBF curve of HHLY-3 high-precision constant current source

7.Application block diagram of HHLY-X Series High-Precision Constant Current Source


HHLY-3 Connection diagram for typical application of high-precision constant current source

8.External dimensions of HHLY-X Series High-Precision Constant Current Source


External dimensions of HHLY-1 high-precision constant current source (sink)


External dimensions of HHLY-2 high-precision constant current source

External dimensions of HHLY-3 and HHLY-4 high-precision constant current source

The type of package and performance indexes of the circuit can be adjusted and customized according to customer’s demand.
Related Products
Model Series Max. Output Power (W) Input DC Voltage (V) Output Voltage (V)

HAD2700-X Series High-precision Voltage Reference Source

HHLY-X Series High-Precision Constant Current Source