WIDEBAND CURRENT AMPLIFIER

CA-550 SERIES / CA-650 SERIESWIDEBAND CURRENT AMPLIFIER

CA-550 Series / CA-650 Series
CA-550 Series and CA-650 Series are low noise wideband current amplifiers(current to voltage converter) with a high gain.
There are the following 9 types depending on the gain and package type.
CA-550 Series is in a static-shielded 40-pin dual inline package. Low-profile
mount is available.
CA-650 Series is in a static-shielded 20-pin single inline package. This series
is suitable for space-saving, multi- channel and high-density mounting.
CA-554F2
CA-555F2
CA-556F2
CA-557F2
CA-654F2
CA-655F2
CA-656F2
CA-657F21M
10 M
100 M
1G10 G
Gain (V/A)
Frequency Response DC to 1 MHz DC to 500 kHz DC to 250 kHz DC to 100 kHz DC to 20 kHz
Equivalent Input Noise 150 fA/√Hz (typ.) 45 fA/√Hz (typ.) 15 fA/√Hz (typ.) 6 fA/√Hz (typ.) 2.5 fA/√Hz (typ.)Current Density
CA-653F2

ModelMaximum Absolute Rating: Power supply voltage (±Vs) ±18 V, Max. Input current ±30 mA, Max. input voltage at offset adjustment terminal ±Vs
Electrical Characteristics: Unless otherwise specified, power supply ±15 V, temperature 23°C ±5°C, and output load RL=1 MΩ

ModelInput Section
Input type
Maximum input current
Input impedance *1
Recommended signal source resistance
Input bias current *2
Equivalent input noise current density *3
Output Section
Output type
Maximum output voltage *4
Maximum output current *4
Output impedance *1
Output offset voltage *5
Output offset voltage adjustment range *5 *6
Amplification Section
Gain (V/A) *8
Output gain flatness (when setting fc 0, within ±0.5 dB) *9+0.5
10-3 dB Frequency response (Cs=10 pF) *Polarity
Low pass filter output(Cut-off frequency setting: -3 dB)
OthersOperating power supply voltage range
Quiescent current (with no signal)
Performance guarantee temperature range
Temperature and humidity range Operation
Storage
RoHS
CA-550 series (DIP)
Dimensions (mm)CA-650 series (SIP)
WeightCA-653F2

CA-554F2
CA-654F2

CA-555F2
CA-655F2

DC coupling unbalanced, single-ended input±100 nA±10 μA±1 μA
3 kΩ400 Ω1 kΩ
10 MΩ or more
100 kΩ or more
1 MΩ or more
1 pA (typ.)150 fA/√Hz (typ.)
15 fA/√Hz (typ.)
45 fA/√Hz (typ.)
DC coupling unbalanced, single-ended output
±10 V
±5 mA
50 Ω±10%±3 mV±15 mV *7
1×106 (1 M) ±1%
DC to 100 kHz
DC to 1 MHz
Non-inverting
100 kHz *11 *12

1×107 (10 M) ±1%
DC to 50 kHz
DC to 500 kHz
10 kHz *11 *12±15 V ±1 V
±40 mA or less, ±32 mA (typ.)23°C ±5°C-20°C to 60°C 10 % to 90 % RH
-30℃ to 80°C 10 % to 80 % RHDirective 2011/65/EU
59 (W) × 39 (D) × 10 (H)66.7 (W) × 10.5 (D) × 40.8 (H)Approx. 40 g

1×108 (100 M) ±1%
DC to 25 kHz
DC to 250 kHz

CA-556F2
CA-656F2

CA-557F2
CA-657F2±10 nA
10 kΩ
100 MΩ or more

±1 nA30 kΩ
1 GΩ or more

6 fA/√Hz (typ.)2.5 fA/√Hz (typ.)±5 mV±15 mV±20 mV *7

1×109 (1 G) ±1%
DC to 10 kHz
DC to 100 kHz

1×1010 (10 G) ±1%
DC to 2 kHz
DC to 20 kHz
1 kHz *11 *12±40 mA or less, ±27 mA (typ.)*1 Nominal values when f = 1 kHz, when f = 100 Hz for CA-557F2 and CA-657F2 *2 The input bias current approximately doubles as the temperature increases by +7 ℃
*3 Measured with a Keysight 89410A equivalent when f = 1 kHz, when f = 100 Hz for CA-557F2 and CA-657F2 *4 Tolerance for distortion (THD) at 1 kHz is 0.3 % or less, andthat at 100 Hz for CA-557F2 and CA-657F2 is 0.3 % or less *5 Input is opened. *6 Nominal values *7 Adjustment by using an external variable resistor *8 Measured with DC*9 Reference frequency: f=10 Hz , f=1 Hz for CA-557F2 and CA-657F2 *10 “Cs” is an added input capacitance between input and GND. *11 Possible to change by using
an external capacitor *12 Pin-16 is opened.

1WIDEBAND CURRENT AMPLIFIER

CA-550 SERIES / CA-650 SERIES

Basic connection diagram

403938373635

34

33

32

3130

2928

27

26

25

24

23

22

21

1

23

4

5

67

8

9

10

1112

13

14

15

16

17

18

19

20

CA-550 Series
0.1μ
cer 0.1μ

SIGNAL INPUT

MAIN OUTPUTCLPF

LPF OUTPUT

20 kcer

GND +15 V -15 V

CA-650 Series

12345678910111213141516171819200.1μ
cer 0.1μ

SIGNAL INPUTTOP VIEW

GND +15 V -15 V

NC

GND

GND

NC

NC

GND

NC

GND

GND

GND

GND

NC

GND

NC

GND

NC

GND

NC

GND

NC

4039383736353433323130292827262524232221

Rf0 dB

LPF
fc

A3

Gain20dB

A45012345678910111213

14

151617181920

SIGNAL INPUTSIGNAL RETURN

GND+15V-15V

GND

OFFSET ADJ

GND

GND

GND

GND

INTERNAL USE

GNDINTERNAL USE

GND

EXT LPFCAPACITORGND

LPF OUTPUT

GND

MAIN OUTPUT

1001000 p

A250A1R1Gain1Rf

Gain1A3Gain2A1Rf

Gain1Gain

10 MΩ

60 dB

20 dB 800 kHz 15.8 kΩ

555F2 100 MΩ 60 dB

30 dB 400 kHz 15.8 kΩ

556F21 GΩ

60 dB

40 dB 150 kHz 15.8 kΩ

557F210GΩ

60 dB

50 dB

40 kHz158 kΩ

34567891011121314151617181920

SIGNAL RETURN

GND

+15 V

-15 V

GND

OFFSET ADJ

GND

GND

GND

GND

INTERNAL USE

GND

INTERNAL USE

GND

EXT LPFCAPACITORGNDLPF OUTPUT

GND

MAIN OUTPUT

501000 p
2

SIGNAL INPUT

1001CA-653F2fc

R1ModelRfGain1Gain2653F21 MΩ

50 dB

20 dB 1.2 MHz 1.58 kΩ

654F210 MΩ

60 dB

20 dB 800 kHz 15.8 kΩ

655F2 100 MΩ 60 dB

30 dB 400 kHz 15.8 kΩ

656F21 GΩ

60 dB

40 dB 150 kHz 15.8 kΩ

657F210GΩ

60 dB

50 dB

CA-557F2/657F2
108 -1000 (Fc ≤ 100 kHz)Fc [Hz]

CLPF [pF]=

CA-554F2/555F2/556F2
CA-654F2/655F2/656F2
CLPF [pF]=

R1A4A2Equation of external capacitor (EXT LPF CAPACITOR)

CLPF [pF]=

fc0dB

50

CA-650Series

Model
554F20 dB

LPF
fc

R1CA-550Series

LPF OUTPUT

20 kcer

Block diagram

MAIN OUTPUT

CLPF

107 -1000 (Fc ≤ 10 kHz)Fc [Hz]2106 -1000 (Fc ≤ 1 kHz)Fc [Hz]40 kHz158 kΩWIDEBAND CURRENT AMPLIFIER

CA-550 SERIES / CA-650 SERIES

Characteristics

Frequency Response

CA-653F2 (1 M V/A)

CA-554F2/CA-654F2 (10 M V/A)
10Cs=10pF

Cs=10pF

Cs=100pF

Cs=100pF

Cs=1nF

Cs=1nF

0Gain [dB]Gain [dB]-3

Cs=10 pF: fc=1 MHz or more
Cs=100 pF: fc=700 kHz or more
Cs=1 nF:
fc=350 kHz or more-10

Cs=10 pF: fc=578.8 kHz
Cs=100 pF: fc=530.9 kHz
Cs=1 nF: fc=149.6 kHz-20-30Frequency [Hz]10CA-555F2/CA-655F2 (100 M V/A)

Cs=10pF

Cs=1nF00-3

Gain [dB]Gain [dB]

Cs=100pF-3-10

Cs=10 pF: fc=290.1 kHz
Cs=100 pF: fc=217.5 kHz
Cs=1 nF:
fc=48.7 kHz

-20

100k

1M

10100

1k

10k

Frequency [Hz]100k-301MCs=100pF

Cs=1nF

0-3-10

Cs=10 pF: fc=21.75 kHz
Cs=100 pF: fc=15.85 kHz
Cs=1 nF: fc=4.34 kHz

-20

10100

1k

10k

100k

1M

Frequency [Hz]3

Cs=1nF

Cs=10 pF: fc=112.2 kHz
Cs=100 pF: fc=74.5 kHz
Cs=1 nF: fc=15.4 kHz

10100

1k

10k

Frequency [Hz]CA-557F2/CA-657F2 (10 G V/A)
Cs=10pF

Cs=100pF-10-2010Gain [dB]10k

10Cs=10pF-30

1kFrequency [Hz]CA-556F2/CA-656F2 (1 G V/A)

10-30

100100k

1MWIDEBAND CURRENT AMPLIFIER

CA-550 SERIES / CA-650 SERIES

Characteristics
Output Noise Voltage Density

CA-653F2 (1 M V/A)
Output noise voltage density [μV/√Hz]

101150 nV/√Hz(Equivalent input noise current 150 fA/√Hz)

0.1
Main Output
LPF Output

0.01
101001k

10k

100k

1M

10M

Frequency [Hz]CA-555F2/CA-655F2 (100 M V/A)

CA-554F2/CA-654F2 (10 M V/A)
100422 nV/√Hz(Equivalent input noise current 42.2 fA/√Hz)

Output noise voltage density [μV/√Hz]

Output noise voltage density [μV/√Hz]

1010.1Main Output
LPF Output

0.01
10100

1k

10k

100k

1.36 μV/√Hz(Equivalent input noise current 13.6 fA/√Hz)
101
Main Output
LPF Output

0.1
101M

100

Frequency [Hz]CA-556F2/CA-656F2 (1 G V/A)
4.42 μV/√Hz(Equivalent input noise current
4.42 fA/√Hz)

1
Main Output
LPF Output

100

1k

10k

Frequency [Hz]

100k

1M

CA-557F2/CA-657F2 (10 G V/A)

100.1
1010k

1000
Output noise voltage density [μV/√Hz]

Output noise voltage density [μV/√Hz]

100

1k

Frequency [Hz]100k14.3 μV/√Hz(Equivalent input noise current 1.43 fA/√Hz)
10010Main Output
LPF Output

1101M

4100

1k10kFrequency [Hz]100k1MWIDEBAND CURRENT AMPLIFIER

CA-550 SERIES / CA-650 SERIES

Characteristics
Pulse Response

CA-653F2 (1 M V/A)
15Cs=10p F

Cs=100 pF

Cs=1 nF

Output Voltage [V]1050
Cs=10 pF: tr=0.35 μs
Cs=100 pF: tr=0.50 μs
Cs=1 nF: tr=1.00 μs-5-10-15
00.5

11.5

22.5Time [μs]33.5

4CA-555F2/CA-655F2 (100 M V/A)

CA-554F2/CA-654F2 (10 M V/A)
15Cs=10p F

Cs=100 pF

15Cs=1 nF

50Cs=10 pF: tr=0.61 μs
Cs=100 pF: tr=0.68 μs
Cs=1 nF:
tr=2.42 μs-5-10-15

50

Cs=10 pF: tr=1.22 μs
Cs=100 pF: tr=1.64 μs
Cs=1 nF: tr=7.07 μs-50

123Time [μs]45-1560CA-556F2/CA-656F2 (1 G V/A)
Cs=10p F

Cs=100 pF

510Time [μs]1520CA-557F2/CA-657F2 (10 G V/A)
15Cs=1 nF

10Cs=10p F

Cs=100 pF

Cs=1 nF

10Output Voltage [V]Output Voltage [V]Cs=1 nF-101550

Cs=10 pF: tr=3.06 μs
Cs=100 pF: tr=4.66 μs
Cs=1 nF: tr=22.6 μs-5-10-15Cs=100 pF

10Output Voltage [V]Output Voltage [V]

10Cs=10p F

50Cs=10 pF: tr=15.5 μs
Cs=100p F: tr=21.2 μs
Cs=1 nF: tr=85.1 μs-5-100102030
Time [μs]4050-1560

5050

100Time [μs]150200WIDEBAND CURRENT AMPLIFIER

CA-550 SERIES / CA-650 SERIES

Dimensions
CA-650 Series

0.50.52.54

5.37

19×2.54=48.26(0.6)

C
1.
5

40.8(4.5)
47.3

91(14.5)

59

35.56

393

10.5

66.7

1.65

100.25

CA-550 Series

0.5

ø1.6

7.62

0.5
2.54

5.9(5.37)

19×2.54=48.26(7.62)

63.5

Evaluation kit

PA-001-2179 for both CA-550 series and CA-650 series

The kit to evaluate characteristics before mounting on the printed
circuit board.

❹Current input
Main output
Power input (HR10-7R-4P connector)
Power input (terminal block)LPF output
LPF cut-off frequency setting switch
Offset voltage adjusting variable resistor❸❷❶❼❻

DIP

❺

SIP

* Terminals and switches on the evaluation kit

NF Techno Commerce Co., Ltd. International Sales Division
Meiko Building, 3-1-13 Nishi-Ikebukuro, Toshima-ku, Tokyo 171-0021, Japan
Phone : +81-3-5957-1809 Fax : +81-3-5957-1813

NF Technology (Shanghai) Co., Ltd.

8F West, No.2 Building, No.889 Yishan Road, Shanghai 200233, China
Phone : +86-21-5238-2338 Fax : +86-21-6415-6576 Toll Free : 400-620-1177